In other words, the pay of women relative to men probably stayed constant not in spite of, but because of, the increase in the female labor force. There is another, complementary reason why the gender gap in earnings was stagnating at the same moment that the gender gap in employment was narrowing.
converge. vb. 1. to move or cause to move towards the same point: crowds converged on the city. 2. to meet or cause to meet; join. 3. (intr) (of opinions, effects, etc) to tend towards a common conclusion or result.
Convergent evolution is just that, or when unrelated organisms evolve similar characteristics due to similar environmental pressures. The word 'converge' means to come together, so two unrelated organisms 'come together' to have similarities due to environmental pressures.