In the U.S. and other high-income countries, where most of the population lives in urban areas, there is intense scholarly and program interest in the effects of household and neighborhood living standards on health. Yet very few studies of developing-country cities have examined these issues....

We show that games of strategic substitutes (or complements) with aggregation are "pseudo-potential" games, and therefore possess Nash equilibria in pure strategies. Our notion of aggregation is quite general and enables us to take a unified view of several disparate models.

We analyze industrial espionage in a model of two firms: a monopoly incumbent, M, and a potential entrant, E, who owns a noisy intelligence system (IS) of a certain precision a . The IS generates a signal on M’s action and E decides whether or not to enter based on this signal. We show that if...