The Converging Market Work Patterns of Married Mothers and Lone Mothers in Canada
记录了加拿大已婚母亲与单身母亲就业率从1973年到1980年代末的趋同趋势，发现标准劳动供给变量只能解释29%的趋同，其余归因于不可观测因素的变化。
In 1973, Canadian lone mothers were more likely to work in the market than were married mothers. By the late 1980s, the opposite was true. My principal objectives are to document this trend and to consider how well one can account for it by using those variables commonly included in cross-sectional studies of labor supply. I find that the standard set of conditioning variables can account for only 29 percent of the convergence in the employment rates of married and lone mothers. The remainder of the convergence is attributable to changes in unobservable factors.