“…Male-dominated majors, such as chemical engineering, may generally have higher returns than such female-dominated majors as elementary education, and these differences in pre-labor market choices are a potentially crucial part of the story in understanding the gender wage gap among the well educated. The role of college major on earnings and the impact on gender wage gaps in the U.S. has been documented in several studies, including Altonji (1993), Brown and Corcoran (1997), Eide (1994), Graham and Smith (2005), Grogger and Eide (1995), Joy (2003), Loury (1997), McDonald and Thornton (2007), Paglin and Rufolo (1990), Turner and Bowen (1999), and Weinberger ( , 1999. While all of these studies report that college major is associated with some portion of the wage gap, they differ in the size attributed to college major; in our reading, much of this difference is the result of the extent of aggregation of the college majors; the finer the detail in the measurement of college major, the greater the fraction of the wage gap that is explained by the major.…”