He found lefties earn "10–12 percent lower annual earnings than righties, roughly equivalent to the return to a year of schooling in these samples," the study says.
Goodman also claims lefties have more behavioral and emotional problems and typically "work in occupations requiring less cognitive skill." He asserts left-handedness is also associated with lower birth rate and other prenatal issues, so that may cause developmental problems for some.
"My study found that that differential brain wiring may affect the way people process language. And that seems to have a little effect on math scores, reading scores, and earnings later in life," Goodman told FoxNews.com.
The study is published in the Journal of Economic Perspectives.
