Game theory is a tool for studying competitive behavior between firms in monopolistic competition because of the mutual interdependence among the firms

The more people who have cell phones, the more valuable they are to everyone. This is an example of a(n) ________

A) moral hazard B) adverse selection C) negative externality D) network externality

Consumption expenditures include spending by households on:

A. residential housing. B. exports. C. services. D. inventories.