If they have a son, that increases to a hefty 6.4%. David Ross of Columbia Business School, one of the authors, says all fathers feel a duty to support their families.

如果他们生的是儿子，这一差距更增大到6.4%。该研究报告的作者之一哥伦比亚商学院的David Ross表示，所有父亲都会感到有挣钱养家的责任。