Steven D. Levitt said this quote

But a mountain of recent evidence suggests that teacher skill has less influence on a student's performance than a completely different set of factors: namely, how much kids have learned from their parents, how hard they work at home, and whether the parents have instilled an appetite for education.

~ Steven D. Levitt

Are people innately altruistic? is the wrong kind of question to ask. People are people, and they respond to incentives. They can nearly always be manipulated--for good or ill--if only you find the right levers.

~ Steven D. Levitt

A woman's income appeal is a bell-shaped curve: men do not want to date low-earning women, but once a woman starts earning too much, they seem to be scared off.

~ Steven D. Levitt

There are three basic flavours of incentive: economic, social and moral.

~ Steven D. Levitt