We study optimal pricing in the presence of recommender systems. A recommender system affects the market in two ways: (i) it creates value by reducing product uncertainty for the customers and hence (ii) its recommendations can be offered as add-ons which generate informational externalities....

Governments often aim to influence the amount and sectoral allocation of private investments through explicit or implicit subsidies. The rules used to select projects to benefit from subsidies may vary, depending on the policy objective. This paper develops a general framework to allocate...