It's 2014, and women are still paid less than men. Does this suggest that a gender pay gap is an unfortunately permanent fixture? Will it still be with us in 50 years? I would predict yes. But by that point, it will be men who will be earning less than women.

If women's choices - such as taking time off to rear children - make them less productive in the economy, does adolescent boys' behavior in school make them even less so, because they are missing the educational potential of their formative years?

Even when a man and a woman perform equally well in a task - say, solving math problems - men are more willing to enter competitions based on that task. Men also show less risk aversion.

Sendhil Mullainathan Quotes