What happens to the husband's retirement decision when the wife's retirement incentives change?

In this paper, I exploit population-wide administrative data and a Swedish occupational pension reform, which primarily affected a subgroup of female workers, to recover the effect of the wife's retirement incentive on the husband's retirement behavior. I estimate a sharp relative decrease in the retirement probability of 63-year-old wives who were treated by the reform. However, there was no significant response of their husbands, and this finding is surprisingly robust. This suggests that cross-effects (from the wife to the husband) are substantially smaller than the direct effects of the wife's own incentive on the wife's retirement