When even the Marxists can't deny it...

Student of Samuel Bowles and co-founder of the Union for Radical Political Economists, Herb Gintis, is honest enough to report his research findings;

My colleagues and I found dramatic evidence of this positive relationship between markets and morality in our study of fairness in simple societies—hunter-gatherers, horticulturalists, nomadic herders, and small-scale sedentary farmers—in Africa, Latin America, and Asia. Twelve professional anthropologists and economists visited these societies and played standard ultimatum, public goods, and trust games with the locals. As in advanced industrial societies, members of all of these societies exhibited a considerable degree of moral motivation and a willingness to sacrifice monetary gain to achieve fairness and reciprocity, even in anonymous one-shot situations. More interesting for our purposes, we measured the degree of market exposure and cooperation in production for each society, and we found that the ones that regularly engage in market exchange with larger surrounding groups have more pronounced fairness motivations. The notion that the market economy makes people greedy, selfish, and amoral is simply fallacious.

That means that capitalism (a free market) is nice.