An investigation into the positive effect of an educated wife on her husband’s earnings: the case of Japan in the period between 2000 and 2003.

We analyze the effect of a wife’s human capital on her husband’s earnings, using individual-level data for Japan in the period 2000–2003. We find a positive association between a wife’s education and her husband’s earnings, which can be attributed to the assortative mating effect as well as the positive effect of an educated wife on her husband’s productivity. We divide the sample into those couples with non-working wives and those with working wives, and also employ an estimation strategy proposed by Jepsen (2005), attempting to control for the assortative mating effect. Our regression analysis provides suggestive evidence that educated wives increase their husbands’ productivity and earnings only when they are non-workers and have sufficient time to support their husbands.