Mothering, Ideologies of 607 for longer family leave or more flexible work for lower pay, or may leave the workforce entirely. These types of explanations have received less empirical support. The penalties and bonuses have remained robust in statistical models that control for selection factors and " compensating differentials " such as flexibility and family leave. In summary, motherhood
... [Show full abstract] reduces women's wages, whereas fatherhood increases men's wages. Married, white mothers and fathers incur the largest penalties and bonuses, respectively. Women with fewer economic resources pay larger penalties, whereas men with greater economic resources earn larger bonuses. About one-third of the motherhood wage penalty has been attributed to the loss of human capital—the pauses in career, training, and education that women experience after the birth of a child. Several other theories attempt to explain the residual two-thirds of the motherhood penalty. There has been little support for theories focusing on changes in work effort and productivity following the transition to par-enthood. In contrast, there is more support for theories focusing on employer discrimination against mothers and preferential treatment of fathers. To date, none of these theories (alone or in combination) has fully explained the gender-based wage differentials associated with parenthood.