Here's a press-release describing a paywalled paper in Science magazine, written by a pair of University of Bonn Economists. They conducted an experiment that showed how markets diffused responsibility for actions that ended up violating individual moral codes, so that people did things in market contexts that they had previously described as immoral when done individually.
"To study immoral outcomes, we studied whether people are willing to harm a third party in exchange to receiving money. Harming others in an intentional and unjustified way is typically considered unethical," says Prof. Falk. The animals involved in the study were so-called "surplus mice", raised in laboratories outside Germany. These mice are no longer needed for research purposes. Without the experiment, they would have all been killed. As a consequence of the study many hundreds of young mice that would otherwise all have died were saved. If a subject decided to save a mouse, the experimenters bought the animal. The saved mice are perfectly healthy and live under best possible lab conditions and medical care.
A subgroup of subjects decided between life and money in a non-market decision context (individual condition). This condition allows for eliciting moral standards held by individuals. The condition was compared to two market conditions in which either only one buyer and one seller (bilateral market) or a larger number of buyers and sellers (multilateral market) could trade with each other. If a market offer was accepted a trade was completed, resulting in the death of a mouse. Compared to the individual condition, a significantly higher number of subjects were willing to accept the killing of a mouse in both market conditions. This is the main result of the study. Thus markets result in an erosion of moral values. "In markets, people face several mechanisms that may lower their feelings of guilt and responsibility," explains Nora Szech. In market situations, people focus on competition and profits rather than on moral concerns. Guilt can be shared with other traders. In addition, people see that others violate moral norms as well.
"If I don't buy or sell, someone else will."