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....

It may be in the interest of low-ability individuals to subsidize the education of high-ability individuals. Sufficient conditions are surprisingly mild: positive externalities in education and complementarity in production between human capital and labor supllied by the low-ability individuals....

The paper introduces a welfarist approach to the national safety of a nation with membership in a defense alliance as an option. The members are risk averse but heterogeneous in their safety classification. There are two public goods as insurance devices, the domestic military budget and the...

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....

It may be in the interest of low-ability individuals to subsidize the education of high-ability individuals. Sufficient conditions are surprisingly mild: positive externalities in education and complementarity in production between human capital and labor supplied by the low-ability individuals....