Extroverts make the best salespeople, right? Wrong. Adam Grant at Wharton studies extroversion and introversion in the workplace, and his findings are fascinating. First, he found that two-thirds of people (aka, the vast majority of us) are ambiverts, or people who don't strongly identify as introverts or extroverts. Because their personality doesn't lean too heavily in either direction, ambiverts can connect more easily, and more deeply, with a wider variety of people. This social flexibility enabled ambiverts to outsell all other groups, moving 51% more product per hour than the average salesperson.