We consider duopolists innovating and producing a good subject to network externalities, so that the reservation price of a consumer increases with aggregate consumption. The post-innovation network consists of two compatible sub-networks, with increased network valuation of the new product....

A rich person who fears a loss of income may later favor redistributive taxation and a mix of taxes and public goods that differs from the one he now favors. If mobility is costly, and if government in each period uses majority voting to determine policy, then this person may prefer to live in a...