In his magnum opus on the power of free markets, Human Action, the Austrian economist Ludwig von Mises noted: "The truth is that capitalism has not only multiplied population figures but at the same time improved the people's standard of living in an unprecedented way. Neither economic thinking nor historical experience suggest that any other social system could be as beneficial to the masses as capitalism. The results speak for themselves. The market economy needs no apologists and propagandists. It can apply to itself the words of Sir Christopher Wren's epitaph in St. Paul's: Si monumentum requires, circumspice." If you seek his monument, look around.

Capitalism may not need apologists and propagandists, but it does need a vigorous scientific and rational defense as evidenced by the fact that so many people still distrust free markets. Market solutions to social problems are generally received with skepticism. Businessmen are distrusted, corporations looked at askance, and there is a well-known resentment against those who have most benefited from markets. (As one New Yorker cartoon featuring two people in conversation reads: "I hated Bill Gates before it became so fashionable.") Why do people distrust free markets?

Part of the answer can be found in our history. Because we lived for so long in small groups of a couple of dozen to a couple of hundred people in hunter-gatherer communities in which everyone was either genetically related or knew one another intimately, most resources were shared, wealth accumulation was almost unheard of, and excessive greed and avarice was punished. Thus, we naturally respond to a free market system in which conspicuous wealth is paraded as a sign of success with envy and anger. Call it evolutionary egalitarianism.

Throughout most of the history of civilization as well, economic inequalities were not the result of natural differences in drive and talent between members of a society equally free to pursue their right to prosperity; instead, a handful of chiefs, kings, nobles, and priests exploited an unfair and rigged social system to achieve gains best described as ill gotten.

People also have a remarkably low tolerance for economic ambiguity. Free markets are chaotic and uncertain, uncontrollable and unpredictable. Most of us have little tolerance for such environments, and we have learned to expect that social institutions such as the government will bring a level of certainty to society. People who cannot afford (or who choose not to purchase) insurance against acts of God typically expect acts of government to save them.

As well, there is well-documented liberal bias in the academy and the media against free markets. A 2005 study by the George Mason University economist Daniel Klein, for example, found that at two of America's leading institutes of higher learning Democrats outnumbered Republicans among the faculty by a staggering ratio of 10 to 1 at the University of California, Berkeley and by 7.6 to 1 at Stanford University. Measuring political attitudes through voter registrations among faculty in twenty different departments, in the humanities and social sciences the ratio was 16 to 1 at both campuses (30 to 1 among assistant and associate professors), and in some departments, such as anthropology and journalism, there wasn't a single Republican to be found.

In another 2005 study on "Politics and Professional Advancement Among College Faculty," Stanley Rothman, S. Robert Lichter, and Neil Nevitte discovered that only 15 percent of those teaching at American colleges and universities describe themselves as conservative while 72 percent said they were liberal, and that figure climbed to 80 percent in such departments as English literature, philosophy, political science, and religious studies, with only five percent labeling themselves as conservative. In a 2005 publication in the Georgetown Law Journal, Northwestern Law Professor John McGinnis reviewed the faculties of the top 21 law schools rated by the 2002 U.S. News & World Report graduate-school rankings and found that politically active professors at these top law schools overwhelmingly tend to be Democrats — 81 percent contributed "wholly or predominantly" to Democratic campaigns while just 15 percent did the same for Republicans.

In a manner and potency matching academia, the bias in the media is against free market economics. A comprehensive 2005 study conducted by UCLA political scientist Tim Groseclose and University of Missouri economist Jeffrey Milyo, published in the Quarterly Journal of Economics, measured media bias by counting the times that a particular media outlet cited various think tanks and policy groups, and then compared this with the number of times that members of Congress cited the same groups. "Our results show a strong liberal bias: all of the news outlets we examine, except Fox News' Special Report and the Washington Times, received scores to the left of the average member of Congress." Not surprisingly, the authors discovered that CBS Evening News and the New York Times "received scores far to the left of center" and that "the most centrist media outlets were PBS NewsHour, CNN's Newsnight, and ABC's Good Morning America." Interestingly, USA Today — that ne plus ultra of pop print media — was closest to political center of all newspapers.

The strongest reason for skepticism of capitalism, however, is a myth commonly found in objections to both the theory of evolution and free market economics, and that is that they are based on the presumption that animals and humans are inherently selfish, and that the economy is like Tennyson's memorable description of nature: "red in tooth and claw." After Charles Darwin's The Origin of Species was published in 1859, the British philosopher Herbert Spencer immortalized natural selection in the phrase "survival of the fittest," one of the most misleading descriptions in the history of science and one that has been embraced by social Darwinists ever since, applying it inappropriately to racial theory, national politics, and economic doctrines. Even Darwin's bulldog, Thomas Henry Huxley, reinforced what he called this "gladiatorial" view of life in a series of essays, describing nature "whereby the strongest, the swiftest, and the cunningest live to fight another day."

If biological evolution in nature, and market capitalism in society, were really founded on and sustained by nothing more than a winner-take-all strategy, life on earth would have been snuffed out hundreds of millions of years ago and market capitalism would have collapsed centuries ago. This is, in fact, why WorldCom and Enron type disasters still make headlines. If they didn't — if such corporate catastrophes caused by egregious ethical lapses were so common that they were not even worth covering on the nightly news — free market capitalism would implode. Instead it thrives, but just as eternal vigilance is the price of freedom, so too must it be for free markets, since both are inextricably bound together.