I was so upset that I didn't sleep that night and I still remember the incident. The point is we are evolved to provide the public good of norm enforcement against our will. So long as she has no sense of guilt, she paid no cost for cutting in line. If there are more people like that, well, they're more able to survive in societies that don't have small, clannish groups.
Economist and author Michael Munger of Duke University talks about human wants and desires with EconTalk host Russ Roberts. Human beings have desires about our desires. Can we change what we want? And how should economists and normal human beings think about doing the right thing, what we often call morality? Is acting morally self-interested behavior or is it possible to act selflessly?