College-educated left-handed men could be making it rain dollar bills at a rate of 15 percent more than their similarly educated, righty counterparts. This is according to the findings of a 2006 study by the National Bureau of Economic Research. The same finding was not discovered for left-handed women, which the researchers attributed to possible gender discrimination, as well as a tendency of women to pursue careers in lower-paying sectors [source: Ruebeck, Harrington and Moffitt].
However, in a 2014 paper, Harvard University professor Joshua Goodman wrote, "Lefties also have 10-12 percent lower annual earnings than righties," adding that emotional/behavioral problems and cognitive differences associated with left handedness could play a role. "Lefties work in more manually intensive occupations than do righties, further suggesting that their primary labor market disadvantage is cognitive rather than physical." Nevertheless, there are some famous left-handed millionaires including Bill Gates, Michael Bloomberg and Oprah Winfrey.