Here is Steve Landsburg’s follow-up column, from Slate.com, it includes an excellent summary of the original debate as to whether daughters cause divorces.
The bottom line: Landsburg argues convincingly that divorce really is more common when parents have a daughter, rather than a son. Now here is Steve’s new explanation for this fact:
Suppose parents believe that inherited wealth is more important to a boy than to a girl–either because wealth gives boys a bigger advantage in the mating competition or because boys are more likely to do something entrepreneurial. Then parents of boys will try harder than parents of girls to preserve their wealth. In particular: 1) Parents of boys will avoid divorce, because divorce is costly; and 2) parents of boys will have fewer children, because extra children dilute the inheritance.
My take: I still think that most parents, especially fathers, simply prefer boys, whether they admit it or not. But like Steve, I consider myself an exception to this principle!