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When people think of fashion, they often picture runway shows, luxury brands, pricey handbags, or the latest trends among teens and young adults. Fashion can be elite and expensive or cheap and fleeting—a statement made through clothing, hairstyles, or even body modifications. Regardless of gender, fashion is frequently viewed as a way to signal income, social status, group affiliation, personal taste, or even to attract a partner. But why does fashion serve these purposes, and where do these associations come from? An evolutionary perspective offers surprising insights into the role of fashion in signaling status and sexual attraction.

The adaptive nature of ornamentation is something that has been long admired and studied in a wealth of nonhuman species. Most examples are ornaments the animals grow themselves.1 Consider the peacock’s tail, a sexually selected trait present only in males.2 Peahens are attracted to males with the largest and most symmetrical tails.

The ability of males to grow a large and symmetric tail is related to their overall fitness (the ability to pass their genes into the next generation), so that females that mate with them will have better quality offspring. Studies have shown that altering the length and symmetry of peacock tails influences mating success—shorter tails lead to less mating opportunities for the males. Antlers are primarily found on male members of the Cervidae family, which include elk, deer, moose, and caribou (the one species in which the females also grow antlers).3 Antlers, unlike horns, are shed and regrown every year. They are used as weapons, symbols of sexual prowess or status, and as tools to dig in the snow for food. Antlers increase in size until males reach maturity, and grow larger with better nutrition, higher testosterone levels, and better health or absence of disease during growth. The size of a male’s antlers is also influenced by genetics and females prefer to mate with males with larger antlers compared to smaller ones (much like in the peacocks).4, 5

In many species, exaggerated male structures like tails, antlers, bright coloration, and sheer size can serve as a weapon in intrasexual competition and as an ornament to signal genetic quality and thereby promote female choice. As a result, much attention has been focused on male ornamentation in nonhuman animals and what it indicates.6 Moreover, males of various species add outside materials to their bodies, nests, and environments specifically to attract mates. Consider the caddisfly, the bower bird, and even the decorator crab; all use decoration to attract females.7 Interestingly, in what are often referred to as sex role-reversed species, such as the pipefish,8 it is the females who are more competitive for mates and are more highly ornamented. But what about humans? Has ornamentation or fashion in humans also been shaped by sexual selection?

Humans do not have “natural” ornaments like tails or antlers to display their quality.

Humans have a fascination with fashion, as best summed up by the psychologist George Sproles:9 “Psychologists speak of fashion as the seeking of individuality; sociologists see class competition and social conformity to norms of dress; economists see a pursuit of the scarce; aestheticians view the artistic components and ideals of beauty; historians offer evolutionary explanations for changes in design. Literally hundreds of viewpoints unfold, from a literature more immense than for any phenomenon of consumer behavior.” To be fair, humans do not have “natural” ornaments like tails or antlers to display their quality. They also do not have much in the way of fur, armor, or feathers to protect their bodies or to regulate temperature, so “adornment” in the form of clothing was necessary for survival. However, humans have spent millennia fashioning and refashioning what they wear, not just according to climate or condition, but for status, sex, and aesthetics.

If fashion has been such a large part of human history with deep evolutionary roots, why do so many trends, preferences, and standards fluctuate across cultures and time? This is because fashion is a display of status as well as mating appeal. Many human preferences are influenced by context. For example, male preferences for women’s body size and weight shift with resource availability; in populations with significant history of food shortages, larger or obese women are prized. Larger women are displaying that they have, or can acquire, resources that others cannot and have sufficient bodily resources for reproduction.10 When resources are historically abundant, men prefer thinner women; in this context, these women display that they can acquire higher-quality nutrition and have time or resources to keep a fit, youthful figure. When tan bodies indicated working outside, and therefore lower standing, pale skin was preferred. When some societies shifted to tan bodies reflecting a life of resources and leisure, they gave tanning prestige, and it became “fashionable.”11

The shifts in what is fashionable can be attributed to these environmental changes, but one principle remains constant: if it displays status (social, financial, or sexual), it is preferred.12 A good example of this would be jewelry, which shifts with fashion trends—whether gold or silver is in this season, or whether rose gold is passé. However, if the appeal of jewelry was just aesthetic—to be shiny or pretty—people would not care whether the jewels were real and expensive or cheap “costume” jewelry. However, they do care, because expense indicates greater wealth and status. This is so much so that people often make comments regarding the authenticity or the size (and therefore cost) of jewels, such as the size of diamonds in engagement rings.13

Fashion for Sexual Display

It would be surprising if fashion and how humans choose to ornament themselves was not influenced by sexual selection. Humans show a number of traits associated across other species that are sexually selected, including dimorphism in physical size and aggression, delayed sexual maturity in males, and greater male variation in reproductive success (defined as the number of offspring).14 Men typically choose clothing that emphasizes the breadth of their shoulders and sometimes adds to their height through shoes with lifts or heels. In many modern western populations, men also spend significant time crafting their body shape by weight lifting to attain that triangle shaped upper body without the benefit of shoulder pads or other deceptive tailoring signals. These are all traits that females have been shown to value in terms of choosing a mate.15

Illustration by Marco Lawrence for SKEPTIC

Examining artistic depictions of bodies provides particular insights into human preferences, as these figures are not limited by biology and can be as exaggerated as the artist wants. We can also see how the population reacts to these figures in terms of popularity and artistic trends. The triangular masculine body shape has been historically exaggerated in art and among fictional heroes, and this feature continues today as comic books and graphic artists create extreme triangular torsos and film superhero costumes with tight waists and padded shoulders and arms. These costumes are not new and do not vary a great deal. They mimic the costume of warriors, soldiers, and other figures of authority or dominance. As cultural scholar Friedrich Weltzien writes, “The superhero costume is an imitation of the historical models of the warrior, the classic domain of heroic manhood.”16

If it displays status (social, financial, or sexual), it is preferred.

Indeed, military personnel and heroes share behaviors and purposes (detecting threats, fighting adversaries, protecting communities, and achieving status in hierarchies). These costumes act as physical markers and are used to display dominance in size, muscularity, and markers of testosterone. Research has found that comic book men have shoulder-to-waist ratios (the triangular torso) and upper body muscularity almost twice that of real-life young men, and that Marvel comic book heroes in particular are more triangular and muscular than championship body builders. What is remarkable is that even with imaginary bodies, male comic book hero “suits” have several features that, not coincidentally, exaggerate markers of testosterone and signal dominance and strength. Even more triangular torsos are created by padded shoulders and accents (capes, epaulets) and flat stomachs (tight costumes with belts, abdominal accents) with chest pieces that have triangular shapes or insignia, large legs and footwear (boots, holsters), and helmets and other face protection that create angular jawlines.17

Men’s choice of clothing and jewelry … convey information about status and resources that are valued by the opposite sex for what they may contribute to offspring success.

The appearance of a tall, strong, healthy masculine body shape is often weighted strongly by women in their judgments of men. There is also an interaction between sex appeal and status. Women choose these men in part because the men’s appearance affects how other men treat them. Men who appear more masculine and dominant elevate their status among men, which makes them more attractive to women.18 Men’s choice of clothing and jewelry or other methods of adornment can not only emphasize physical traits but also convey information about status and resources that are valued by the opposite sex for what they may contribute to offspring success. Some clothing brands (or jewelry) are more expensive and are associated with more wealth, and so are likely to attract the attention of the opposite sex; think of brand logos, expensive watches, or even the car logo on a keychain as indicators of wealth.19

Female fashion also shows indications of being influenced by its ability to signal mate value or enhance it, sometimes deceptively. In many mammals, female red ornamentation is a sexual signal designed to attract mates.20 Experimental studies of human females suggest that they are more likely to choose red clothing when interacting with an attractive man than an attractive woman;21 the suggestion being that red coloration can serve a sexual signaling function in humans as well as other primates. Red dyes in clothing and cosmetics have been extremely popular over centuries, notably cochineal, madder, and rubia. In fact, the earliest documented dyed thread was red.22

One of the primary attributes that women have accentuated throughout time is their waist-to-hip ratio, a result of estrogen directing fat deposition23—a signal of reproductive viability. The specific male preferences regarding waist to hip ratio have been documented for decades.24 But is this signal, and its amplification, really a global phenomenon? It is easy to give western examples of waist minimization and hip amplification—corsets, hoop skirts, bustles, and especially panniers,25 or fake hips that can make a woman as wide as a couch. Even before these, there was the “bum roll”—rolled up fabric attached to a belt to create a larger bulge over the buttocks.

Outside of Western cultures, one can find a variety of “wrappers” (le pagne in Francophone African cultures), yards of fabric wrapped around the hips and other parts of the body to accentuate and amplify the hips.26 Not surprisingly, these are also a show of status as the quality of the fabric is prioritized and displayed.

Just as with men, this specific attribute is wildly exaggerated in fictional depictions of women, from ancient statues to contemporary comic, film, and video game characters. One study concluded that “when limitations imposed by biology are removed, preferred waist sizes become impossibly small.”27 Comic book heroines are drawn with skintight costumes and exaggerated waist-to-hip ratios. They have smaller waists and wider hips than typical humans by far; the average waist-to-hip ratio of a comic book woman was smaller than the minimum waist-to-hip ratio of real women in the U.S. Heroine costumes further accentuate this already extreme curve by use of small belts or sashes, lines, and color changes. Costumes are either skintight or show skin (or both), with cutouts on the arms, thighs, midriff, and in particular, on the chest to show cleavage. The irony of battle uniforms that serve no protective purpose has been pointed out many times in cultural studies.28

Another feminine feature that plays a role in fashion is leg length. Various artistic depictions of the human body throughout history show that while the ideal leg length in women has increased over time, the preference for male leg length has not shifted. This increase appears to emerge during the Renaissance, which may be due to increases in food security and health during that time. As with many physical preferences in humans, leg length can be an indicator of health, particularly in cases of malnutrition or illness during development. This is another important reminder that preferences are shaped by resources, and consistently shift toward features that display status. What is the ideal leg length? One study found that if a woman’s height was 170 cm (5 foot 7 inches), the majority favored a leg length that was 6 cm (2.36 inches) longer, a difference that corresponds to the average height of high-heeled shoes.29 You can probably see where this is going: Sexual attractiveness ratings of legs correlate with perceived leg length, and legs are perceived as longer with high-heeled shoes. It should come as no surprise that women may accentuate or elongate their legs with high heels.

Photo by Ham Kris / Unsplash

High heeled shoes were not originally the domain of women, as they are thought to have originated in Western Asia prior to the 16th century in tandem with male military dress and equestrianism. The trend spread to Europe, with both sexes wearing heightened heels by the mid-17th century.30 They have remained present in men’s fashion in the form of shoes for rockstars and entertainers (e.g., Elton John), and boots worn by cowboys and motorcyclists. However, these heels are either short or hidden as lifts to make the men appear taller. By the 18th century, high heels became worn primarily by women, particularly as societies redefined fashion as frivolous and feminine.

As one might expect, high heels do more than elongate legs and increase height. High heels change the shape of the body and how it moves. Women wearing heels increase their lumbar curvature and exaggerate their hip rotation, breasts, and buttocks, making their body curvier. As supermodel Veronica Webb put it, “Heels put your ass on a pedestal.” When women walk in heels, they must take smaller steps, utilize greater pelvic rotation, and have greater pelvic tilt. All of these changes result in greater attractiveness ratings. Wearing high heels also denotes status—high heel shoes are typically more expensive than flat shoes, and women who wear them sustain serious damage if they have occupations that require a lot of labor. Therefore, women who wear heels appear to be in positions where they do less labor and have more resources. Research has asked this question directly, and both men and women view women in high heels as being of higher status than women wearing flat shoes.31

Fashion can also signify membership in powerful groups, such as the government, the military, or nobility.

At this point, it’s hardly surprising to learn that, compared to actual humans, comic book women are depicted with longer legs that align with peak preferences for leg length in several cultures, while men are shown with legs of average length. Women are also far more often drawn in heels or on tiptoe, regardless of context. Women are even drawn on tiptoe when barefoot, in costume stocking feet, and even when wearing other types of shoes or boots. This further elongates their already longer legs.32

Fashion as Status Signaling

Social status, as previously mentioned in terms of traits valued by the opposite sex, is also often displayed through fashion in ways relevant to within-sex status signaling, particularly when it comes to accessories. Men making fashion choices that indicate masculinity and dominance include preferences for expensive cars and watches—aspects of luxury consumption.33 Women not only emphasize their own beauty but also carry bags, for example, that are brand conscious, conveying information about their wealth and perhaps their preferences for specific causes, as in the popularity of animal welfare friendly high-end brands such as Stella McCartney.

Unlike high-end cars, however, which signal status to possible mates as well as status competitors, men are largely unaware of the signals sent from women to other women by such accessories. Women are highly attuned to brands and costs of women’s handbags, while most men do not seem to recognize the signaling value.34 While luxury products can boost self-esteem, express identity, and signal status, men tend to use conspicuous luxury products to attract mates, while women may use such products to deter female rivals. Some studies have shown that activating mate guarding motives prompts women to seek and display lavish possessions, such as clothes, handbags, and jewelry, and that women use pricey possessions to signal that their romantic partner is especially devoted to them.35

Fashion can also signify membership in powerful groups, such as the government, the military, or nobility. It can also signify the person’s role in society in other ways, for example, whether someone is married, engaged, or betrothed (by their own volition or by family). There are several changes in fashion that are specific to the various events surrounding a wedding, each with its own cultural differences and symbolism, and far too many to review here.36 Several researchers have explored the prominence and the symbolic value of a bride’s traditional dress in different societies.37 However, these signifiers are not just specific to the wedding rituals; what these women wear as wives (and widows) is culturally dictated for the rest of their lives.

These types of salient markers of female marital status are present in a number of societies. For example, not only are Latvian brides no longer allowed to wear a crown, but they may be given an apron and other displays (such as housekeeping tools) that indicate that they are now wives. In other cultures, girls will wear veils from puberty to their wedding day, and the removal of the veil is an obvious display of the change in status. Some cultures symbolically throw away the bride’s old clothes, as she is no longer that person; she is now the wife of her husband. In Turkey, married Pomak women cut locks of hair on either side of their head, and their clothing is much simpler in style than the highly decorated daily clothing of unmarried Pomak women. However, wives do wear more expensive necklaces—gold or pearls rather than beads.38 Notice that this is not only a signal of marital status, but also a signal of the groom’s wealth.

An evolutionary perspective suggests … people who choose to tattoo and pierce their bodies are doing so … because it serves as an advertisement or signal of their genetic quality.

Meanwhile, for men, the vast majority of cultures possess only one marker for married men—a wedding ring—which is also expected of women. Why are there more visible markers of marital status for women than for men? This seems likely to be a product of the elevated sexual jealousy and resulting proprietariness employed by men to prevent cuckoldry—what evolutionary psychologists call mate guarding. Salient markers of marital status for women show other men that she is attached to, or the property of, her husband. If the term “property” seems like an exaggeration, cultures have been documented to have rituals specifically for the purpose of transferring ownership of the bride from her parents to her husband, with the accompanying changes in appearance to declare that transfer to the public.39

Tattoos as Signals of Mate Quality, Social Status, and Group Membership

Body modifications, such as tattoos and piercings, have become increasingly prevalent in recent years in Western culture, with rates in the United States approaching 25 percent.40 Historically, tattooing and piercing were frequently used as an indicator of social status41 or group membership, for example, among criminals, gang members, sailors, and soldiers. While this corresponds with all of the other types of adornment we have reviewed, other researchers have suggested that these explanations don’t fully illuminate why individuals should engage in such costly and painful behavior when other methods of affiliation, such as team colors, clothing, or jewelry are less of a health risk. Tattoos and piercings are not only painful but entail health risks, including infections and disease transmission, such as hepatitis and HIV.42 One could suggest that the permanence of body modifications is a marker of commitment or significance, but an evolutionary perspective suggests an additional level of explanation: that people who choose to tattoo and pierce their bodies are doing so not only to show their bravery and toughness, but also because it serves as an advertisement or signal of their genetic quality. Good genetic quality and immunocompetence may be signaled by the presence and appearance of tattoos and piercings in much the same way as ornamentation, much as the peacock’s tail (in its size and symmetry), serves as a signal of male health and genetic quality.43

Photo by benjamin lehman / Unsplash

Even with tattoos, the same areas of the body are accentuated as we see in clothing.44 Researchers have reported sex differences in the placement of tattoos such that their respective secondary sexual characteristics were highlighted, with males concentrating on their upper bodies drawing attention to the shoulder-to-hip ratio. Females had more abdominal and backside tattoos, drawing attention to the waist-to-hip ratio. The emphasis seems to be on areas highlighting fertility in females and physical strength in males, essential features of physical attractiveness.45 In fact, female body modification in the abdominal region was most common in geographic regions with higher pathogen load, again suggesting that such practices may serve to signal physical and reproductive health.46 Recent work has also indicated social norms influence how tattoos affect perceptions of beauty such that younger people and ones who themselves are tattooed see them as enhancing attractiveness.47

Tattoos and piercings are not only painful but entail health risks, including infections and disease transmission, such as hepatitis and HIV.

Studies on humans and nonhuman animals have indicated that low fluctuating asymmetry (that is, greater overall symmetry in body parts) is related to developmental stability and is a likely indicator of genetic quality.48 Fluctuating asymmetry (FA), which is defined as deviation from perfect bilateral symmetry, is thought to reflect an organism’s relative inability to maintain stable morphological development in the face of environmental and genetic stressors. One study found49 FA to be lower (that is, the symmetry was greater) in those with tattoos or piercings. This effect was much stronger in males than in females, suggesting that those with greater developmental stability were able to tolerate the costs of tattoos or piercings, and that these serve as an honest signal of biological quality, at least in the men in this study.50 Researchers have also tested the “human canvas hypothesis,” which suggests that tattooing and piercing are hard to fake advertisements of fitness or social affiliations and the “upping the ante hypothesis,” which suggests tattooing is a costly honest signal of good genes in that injury to the body can demonstrate how well it heals. In short, tattoos and piercings not only display a group affiliation, but also that the owner possesses higher genetic quality and health, and these tattoos are placed on areas that accentuate “sexy” body parts. Thus, we have come full circle with humans: Just as other species like peacocks, people show off ornamentation to display their quality as mates and access to resources. Even taking into account cultural differences and generational shifts, the primary message remains.

Social Factors in Human Ornamentation

In addition to all of the evidence we have presented here, ornamentation is not just about mating or even signaling social status. Humans also signal group membership or allegiance through fashion. Modern sports fans show their allegiance to their sports teams by various shirts, hats, and other types of clothing—think the “cheese head” hats worn by Green Bay Packers fans at the team’s NFL home games. Fans of various musical performers, from Kid Rock to Taylor Swift, display their loyalty with concert shirts and other apparel. Typically, they also feel an automatic sense of connection when they encounter others sporting similar items. As discussed, tattoos can be seen as signals of genetic quality or health, and over the last twenty or so years tattoos have also increasingly become seen as statements of individuality. And yet, many serious sports fans, for example, have similar tattoos representing their favorite teams. Marvel fans sport Iron Man and Captain America illustrations on their skin, while fans of the television show Supernatural have the anti-possession symbol from the show tattooed on their torso. It may be that in many populations with weak social and family connections, individuals are seeking connection, and adornment is one way of indicating participation in a community or group. You can also see this in terms of political allegiance and the proliferation of Harris-Waltz and MAGA-MAHA merchandise during the 2024 election cycle in the United States.

While it is clear that an adaptationist approach to ornamentation can explain many aspects of fashion related to signaling social status (whether honest or not), group membership, or mate quality, much research remains to be done, including more work on what aspects are cross-culturally consistent and that are constrained more by unique cultural aspects or the local ecology. Not everything is the product of an adaptation; some aspects of fashion that seem less predictable or may be less enduring are unlikely to be explained by ornamentation and signaling theory because they are not rooted in mating or social motives. That being said, many fashion choices, including our own (for better or worse) make a lot of sense in the light of evolutionary processes. For all the small shifts from generation to generation and across cultures, the main themes remain the same. As Rachel Zoe noted: “Style is a way to say who you are without having to speak.”

What do your fashion choices have to say?

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I’m participating in the Heterodox Academy meeting in NYC on June 23-25, and its theme is “Truth, Power, and Responsibility.” The program for the entire meeting is here.

I’m on a rather daunting plenary panel on the 25th (below).  The description:

The Duties and Responsibilities of Scholars | Wednesday, June 25 at 12:30-1:50pm What does it mean to be a scholar today—and who gets to decide? In an era marked by rising polarization, increasing public scrutiny of higher education, and shifting institutional expectations, the role of the scholar is more contested than ever. This plenary session brings together leading thinkers from across the academic spectrum to examine whether there are universal norms of scholarship that transcend disciplines, and what obligations scholars have not just to their fields, but to academia at large. This panel, featuring Jerry Coyne (University of Chicago), Jennifer Frey (University of Tulsa), Louis Menand (Harvard University), and John McWhorter (Columbia University), and moderated by Colleen Eren (William Paterson University), will explore where today’s academics derive their sense of duty, how those understandings are evolving, and what responsibilities come with the title of professor.

I suppose I could just let the bigwigs do all the talking, but I do want to make a contribution.  To do that, I’ve been reading quite a bit about academic freedom and free speech. I’ve discovered that they are two separate things, and that, if achieving truth is one’s aim, academic freedom is at least as important as free speech. In These are nascent ideas, so feel free to comment on them below.

First, let’s look briefly at free speech, which most scholars define this way:

Freedom of speech (according to America’s First Amendment): the prohibition of the government to suppress speech in public square. (There are of course exceptions, like harassment, false advertising, defamation, or creating imminent and predictable violence.)

There are three parts of the courts’ interpretation of First Amendment free speech:

a. There can be no content discrimination [A content-based law discriminates against speech based on the substance of what is communicated].

b. There are no true or false opinions for the purpose of the First Amendment. That is, everybody is entitled to their own opinion in all matters, both political and epistemic. This means that the ideas are given equal political consideration, but this doesn’t mean that all opinions are equally valid.

c.  The state cannot compel you to speak. (This is outlined in Robert Posts’s engaging speech).

There are two reasons for a rational democracy to adopt freedom of speech.  First, because a democracy is really government based on public opinion, as it’s ultimately based on votes. And, as we have learned, voters can sometimes have false or even harmful ideas. Second—and this is the philosophical underpinning of all freedom of speech laws—the freedom is supposed to create a “marketplace of ideas”, whose clash through public discussion and expression is supposed to be an essential route to finding TRUTH.  But does it? My view is no: the truth is ultimately determined through academic freedom, which I construe broadly to encompass quasi-scientific investigation using evidence, but investigation not necessarily done by academics.  I’ll discuss this in part 2 of the post, which I may or may not put up today.

The “marketplace of ideas” trope is based largely on the pronouncements of two men: John Stuart Mill and Oliver Wendell Holmes. I’ll give some of their quotes below about the value of the marketplace of ideas:

John Stuart Mill from on “On Liberty”

“He who knows only his own side of the case knows little of that. His reasons may be good, and no one may have been able to refute them. But if he is equally unable to refute the reasons on the opposite side, if he does not so much as know what they are, he has no ground for preferring either opinion… Nor is it enough that he should hear the opinions of adversaries from his own teachers, presented as they state them, and accompanied by what they offer as refutations. He must be able to hear them from persons who actually believe them…he must know them in their most plausible and persuasive form.”

“The peculiar evil of silencing the expression of an opinion is, that it is robbing the human race; posterity as well as the existing generation; those who dissent from the opinion, still more than those who hold it. If the opinion is right, they are deprived of the opportunity of exchanging error for truth: if wrong, they lose, what is almost as great a benefit, the clearer perception and livelier impression of truth, produced by its collision with error.”

. . . . There is the greatest difference between presuming an opinion to be true, because, with every opportunity for contesting it, it has not been refuted, and assuming its truth for the purpose of not permitting its refutation. Complete liberty of contradicting and disproving our opinion, is the very condition which justifies us in assuming its truth for purposes of action; and on no other terms can a being with human faculties have any rational assurance of being right.

The beliefs  which we have most warrant for, have no safeguard to rest on, but a standing invitation to the whole world to prove them unfounded. If the challenge is not accepted, or is accepted and the attempt fails, we are far enough from certainty still; but we have done the best that the existing state of human reason admits of; we have neglected nothing that could give the truth a chance of reaching us: if the lists are kept open, we may hope that if there be a better truth, it will be found when the human mind is capable of receiving it; and in the meantime we may rely on having attained such approach to truth, as is possible in our own day. This is the amount of certainty attainable by a fallible being, and this the sole way of attaining it.

However unwillingly a person who has a strong opinion may admit the possibility that his opinion may be false, he ought to be moved by the consideration that however true it may be, if it is not fully, frequently, and fearlessly discussed, it will be held as a dead dogma, not a living truth.

I have long touted Mill’s tract as of supreme importance in justifying freedom of speech in a democracy. And I still think that, but I no longer agree that the clash of ideas among the public promotes or guarantees emergence of the truth. Something more is needed, and that something, as we’ll see, is evidence.  Note that evidence is not mentioned by Mill.

From Oliver Wendell Holmes as quoted in the Annenberg Classroom:

In his dissent from the majority opinion in Abrams v. United States (upholding the Espionage Act convictions of a group of antiwar activists), U.S. Supreme Court Justice Oliver Wendell Holmes coins his famous “marketplace of ideas” phrase to explain the value of freedom of speech.

The full quote:

“[W]hen men have realized that time has upset many fighting faiths, they may come to believe even more than they believe the very foundations of their own conduct that the ultimate good desired is better reached by free trade in ideas – that the best test of truth is the power of the thought to get itself accepted in the competition of the market, and that truth is the only ground upon which their wishes safely can be carried out. That, at any rate, is the theory of our Constitution. It is an experiment, as all life is an experiment.”

And from an article in Wikipedia: [In] the dissenting opinion by Supreme Court Associate Justice Oliver Wendell Holmes Jr. in United States v. Schwimmer. Holmes wrote that “if there is any principle of the Constitution that more imperatively calls for attachment than any other, it is the principle of free thought—not free thought for those who agree with us but freedom for the thought that we hate.’

Note that he doesn’t mention freedom of speech, but freedom of thought. Freedom of thought is not protected under the First Amendment:

Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.

But does the clash of ideas in the public square produce truth (defined roughly as “something that conforms to fact or reality”) or knowledge (defined as “justified true belief”)? Again, the clash of ideas is necessary in a democracy so that the public can consider all sides of an issue before making decisions on who runs the government. We can argue later about whether certain non-elected parts of the government, like the Supreme Court, operate according to the First Amendment. They certainly don’t, as there is compelled speech—lawyers forced to answer questions—and not all ideas are considered equal.

Well, surely the clash of ideas is necessary to produce truth, but it’s not sufficient.  Let’s take some examples.

One that immediately comes to mind is the clash between creationism and evolution. Everyone is entitled, via free speech, to espouse publicly one or another view in the public square (but not in the classroom).  This is the vaunted clash of ideas.  But did this clash produce truth per se? No, what eventually allowed evolution to overcome creationism is evidence,  and that evidence doesn’t come from opinions, but from epistemic considerations.  What empirical evidence do we have on the side of evolution (ahem, Why Evolution is True), and what evidence on the side of a supernatural hand in creationism? The evidence comes from scholars (or nonscholars employing scientific methods) gathering evidence under the principle of academic freedom: studying, thinking, and publishing what they want, using norms of scholarship and without outside interference.  The finding of “truth” depends not only on a clash of ideas, but on the adducing of evidence by the opposing sides, along with the presumption that the public is rational and thoughtful enough to evaluate that evidence. (It apparently isn’t as judging by the most recent Gallup poll, which shows that 71% of Americans think that God had some had in evolution.)

Second, consider whether everyone is entitled to free government-provided health care, as in the UK and many other countries. Here we have an ongoing clash of ideas, which so far has resulted in an answer of “no” in America, though that could change.  Which “truth” has resulted from this clash? Does the UK have the truth, or the US? The “truth” is that perhaps one of these is better for society than the other, but the clash of ideas itself won’t settle the issue, and even so there would be unresolvable disagreement about what “better” means. What we need is what we don’t have: a comparative experiment (or data) showing the effects of each choice in each society, AND a public that has a widely shared idea of what a “better society” means.

The second question in fact involves not just facts but values: what kind of society do we want?  And while those values might be informed by a clash of ideas, they are based largely on unchangeable personal preferences. Often the clash of ideas rests heavily on morality, and, as I believe, there is no absolute morality and no “moral truth” (let’s put Biblical morality to the side here, since it’s not even clear that there is such a thing). Rather, morality is based on personal preferences, and in many cases (viz., the trolley problem), there is no truth: one simply adheres to one preference over another.

Here’s a third example: should society allow abortion? If some people have views on abortion that hinge on empirical facts, like whether a fetus has a heartbeat, can feel pain, or be viable if removed from the mother, then yes, those views can be informed by empirical investigation, also called “science”.

But there are many who favor an absolute prohibition of abortion because they consider it murder, murder of a potentially viable human being.  Such people feel they are right, but morally right. Other people, like me, favor almost unrestricted abortion up to birth, simply because I believe that a society in which women have that choice is a better society than one in which abortion is forbidden or given time limits.  But is the “truth” here? There is no truth: there is only people deciding what is morally permissible.  Yes, we have a clash of ideas, and yes, it’s resolved in various ways in various states, but the resolution is a political one: a consensus of opinion and not a determination of “truth.”  Again, I don’t see how that clash itself leads to the “truth”. It can lead to a political decision, but since this is largely an issue of preference, there is no truth to be had, no “conforming to what is reality.”

I maintain that most of the clashes of ideas we see in society deal with political or moral issues, hinging on preferences that cannot be adjudicated by argument alone. Some can be adjudicated by empirical investigation, but that is a minority.

In the end, while I believe that a clash of ideas is essential in a democracy simply to have a working democracy, the clash alone does not guarantee homing in on truths about the universe, and in many cases it can’t.  In the cases where it can, the clash involves differing opinions about empirical issues. And it is the resolution of those issues by empirical data that will guide us toward the truth. Absent empirical evidence, which can result only from academic freedom (construed widely as the freedom to think, teach, and research), a mere clash of ideas cannot guide us to the truth.