Economics is an intellectually challenging and socially relevant area of study. According to the Hamilton project studying economics gives you a better shot at striking it rich. Here are some nice figures that illustrate the point:
Updated: These are cumulative distributions. Notice that economics first-order stochastically dominates almost all other majors, and second-order stochastically dominates all other majors. So anyone who has normal risk preferences will choose to do an economics major. Economics pretty much dominates every other major.