reprinted from the Pew Research Center
by Richard Morin
August 9, 2006
Left-handed men who attended at least a year in college go on to earn significantly more than their right-handed classmates -- one more reason they'll be celebrating International Left-Handers Day this Sunday.
"Among the college-educated men in our sample, those who report being left-handed earn 13 percent more than those who report being right-handed," report economists Christopher S. Ruebeck of Lafayette College and his research partners Joseph E. Harrington, Jr. and Robert Moffitt of Johns Hopkins University in a new working paper published by the National Bureau of Economic Research.
And lefties, stay in school: Those who finished all four years of college earned, on average, a whopping 21 percent more than similarly educated right-handed men. Curiously, the researchers found no wage differential between left- and right-handed women.
They also found that lefties were more likely to be found in certain kinds of jobs. "For example, 53 percent of those who are left-handed are in professional occupations, compared to 38 percent of those who are right-handed," they reported.
They based their conclusions on an analysis of data from the federally-funded National Longitudinal Survey of Youth, a nationally representative survey of approximately 5,000 men and women first interviewed in 1993 when they ranged in age from 14 to 21 years old. Their analysis was based on a 1993 follow-up survey, when respondents were ages 28 to 35. Left-handers comprised about 10 percent of their sample, just as they comprise about 10% of the population as a whole.
While evidence of a wage gap was unequivocal, explanations for the disparity were more elusive. The authors suggested that greater innate ability, perhaps due to differences in biology and brain function are two possibilities. But they do not know why they didn't see a similar effect among women.
"Gender discrimination may be obscuring the effects for higher-educated left-handed females," Ruebeck wrote in an e-mail. "The biological literature also suggests differences in cognitive style across handedness in males that do not exist in females. If these differences are responsible for left-handers' higher wages, then we would not expect to find the same result in females."
The study is the latest to suggest there's something special about lefties. Other researchers have found that left-handers are over-represented in some disciplines on university faculties, as well as among gifted students, artists and musicians. And as any pro baseball player will tell you, there are entirely too many southpaws pitching in the big leagues.