Achim Wambach

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Inequity aversion is a special form of other regarding preferences and captures many features of reciprocal behavior, an apparently robust pattern in human nature. Using this concept we analyze the Moral Hazard problem and derive several results which differ from conventional contract theory. Our three key insights are: First, inequity aversion plays a(More)
Ever since the seminal work by Rothschild and Stiglitz (1976) on competitive insurance markets under adverse selection the equilibrium-non-existence problem has been one of the major puzzles in insurance economics. We extend the original analysis by considering firms which face capacity constraints, which might be due to limited capital. We show that under(More)
We examine the interaction in the market for physician services when the total budget for reimbursement is fixed. Physicians obtain points for the services they render. At the end of the period the budget is divided by the sum of all points submitted, which determines the price per point. We show that this retrospective payment system involves -- compared(More)
Optimal Incentive Contracts under Inequity Aversion We analyze the Moral Hazard problem, assuming that agents are inequity averse. Our results differ from conventional contract theory and are more in line with empirical findings than standard results. We find: First, inequity aversion alters the structure of optimal contracts. Second, there is a strong(More)
We consider a situation where an agent’s effort is monitored by a supervisor who cares for the agent’s well–being. This is modeled by incorporating the agent’s utility into the utility function of the supervisor. The first–best solution can be implemented even if the supervisor’s preferences are unknown. The corresponding optimal contract is similar to what(More)
This paper examines the interplay of endogenous vertical integration and cost-reducing downstream investment in successive oligopoly. Analyzing a linear Cournot model, we establish the following key results: (i) Vertical integration increases own investment and decreases competitor investment (intimidation effect). (ii) Asymmetric integration is a(More)
This chapter surveys the developments in price discrimination theory as it applies to imperfectly competitive markets. Broad themes and conclusions are discussed in the areas of first-, secondand thirddegree price discrimination, pricing under demand uncertainty, bundling, and behavior-based discrimination. JEL classifications: D400, L100, L400, L500 JEL(More)