I develop a model of firm diversification into multiple product lines that is based on the agency problem between the firm's managers and owners. The agency relationship, together with a span-of-control managerial technology, determines an optimal firm size and degree of diversification that are...

A model is developed in which corporate spinoffs are a feature of incentive contracts for product managers in diversified firms. I argue that the possibility of a future spinoff can improve current incentives for divisional managers, even if a spinoff rarely actually occurs. Spinoff incentive...