A wife bonus, I was told, might be hammered out in a pre-nup or post-nup, and distributed on the basis of not only how well her husband’s fund had done but her own performance — how well she managed the home budget, whether the kids got into a “good” school — the same way their husbands were rewarded at investment banks. In turn these bonuses were a ticket to a modicum of financial independence and participation in a social sphere where you don’t just go to lunch, you buy a $10,000 table at the benefit luncheon a friend is hosting.Women who didn’t get them joked about possible sexual performance metrics. Women who received them usually retreated, demurring when pressed to discuss it further, proof to an anthropologist that a topic is taboo, culturally loaded and dense with meaning.But what exactly did the wife bonus mean? It made sense only in the context of the rigidly gendered social lives of the women I studied. The worldwide ethnographic data is clear: The more stratified and hierarchical the society, and the more sex segregated, the lower the status of women.