Today marks Equal Pay Day. How are we doing?We have come a long way since I wrote my doctoral dissertation on the pay gap back in the late 1960s.From earning 59 percent of what men made in 1974 to earning 79 percent in 2015 (among year-round, full-time workers),women have broken a lot of barriers.

There is no reason why the remaining gap can’t be closed.The gap could easily move in favor of women. After all, they are now better educated than men.They earn 60 percent of all bachelor’s degree...