Drew Hanson, chapter 2, #7

"It is not from the benevolence of the butcher, the brewer, or the baker that we expect dinner, but from their regard to their own interest"

This quote is what this chapter really boils down to. People feed other, for the vast majority of the time, because they want to feed themselves. If a person isn't incentivized to brew, bake, or... Butch then it won't get done. So the best way to get everyone fed is to make sure that the incentives on feeding serve those who feed so they'll keep feeding people. When there are discontinuities in the incentives and the best service of society (free rider markets, communist governments, crying kids looking for Oreos), systems don't work. The point of economics is lining up the incentives of individuals with what will best serve society.