Justin Sullivan/Alex Wong/Michelly Rall (All Getty)
For example, the third-richest person in the world, Warren Buffett, says he spends 80% of his day tearing through the written word.
We've pored over interviews with some of America's most influential execs - from Bill Gates to Jeff Bezos and Oprah Winfrey - to find out what they read.
Here are the favorites.