As a student, Boseman was accepted into the prestigious theater program but couldn't afford to go.
Substantial evidence shows that gender diversity at the management level enhances performance.
The U.S. is "a relatively lightly taxed country," but there are some nations with even lower tax rates.
"Well-being differences are actually reflected in people's faces," says the study's co-author.
"About 37 percent of our top managers in the bank are female. We need to improve that,” Ewen Stevenson told CNBC in an interview.