"Analysis by the National Bureau of Economic Research found that women earn less as their childrearing responsibilities escalate," writes Joanne Cleaver. "While women earn less from the start, the gap becomes a chasm for women in their 30s. By about age 37, women with college degrees start to earn less than men without college degrees." After exploring the issue, Clever concludes that "Flexible work must not come at the price of equitable pay. Employers need to analyze pay equity not just by gender and tenure, but also by work arrangement."