• The most common major among American billionaires is economics.
  • Business administration and history are the second and third most popular majors.
  • Steve Cohen, Meg Whitman, and Bob Kraft all studied economics in college. 

If you want to make it into the billionaire's club, picking the right college major might be a good place to start.

That's because for the richest people in America, the most common major selected was economics, according to a Forbes analysis of the billionaires who made the latest Forbes 400 list.

The next most popular majors were business administration and history.

Hedge fund manager Steve Cohen, Hewlett Packard Enterprise CEO Meg Whitman, and New England Patriots owner Bob Kraft all chose to major in economics as undergraduates, before launching successful careers.

Economics is also popular at some of the top schools in America. At nearly all of the Ivy League schools, from which many of the billionaires hail, the most popular major is also economics.

It's a smart move. College graduates with an economics degree earn a starting salary of $48,500 on average, almost 20% more than those who major in business administration, according to Payscale.com.

With a masters degree, economists can make even more. Median income for economists in 2016 was $101,050 according to the Bureau of Labor Statistics -- almost double the median income in the US.

Harvard economics professor and renowned economist Gregory Mankiw believes the college major provides huge benefit. "I think it's a great gateway into a lot of different careers," Mankiw told Business Insider in February.

Studying economics is important "so you can read the newspaper, so you can be an intelligent voter, make intelligent decisions as you go about your personal financial life," he continued. "It's a great place to start to learn how the world works."

This post originally appeared on Business Insider.