In the literature on cost-effectiveness analyses, there has recently been considerable debate on <p> the way of measuring the production gain caused by a new treatment as well as its proper evaluation. <p> In this paper, we propose a general framework for the discussion of such questions in the form...</p></p>

We introduce a description of the power structure which is inherent in a strategic game form using the concept of an interaction sheaf. The latter assigns to each open set of outcomes a set of interaction arrays, specifying the changes that coalitions can make if outcome belongs to this open...

A contract where the agent is compensated ex post only upon satisfactory performance, often called a no-cureno-pay contract, can arise as under several circumstances. In this paper, we model the problem of contractual choice as a principal-agent contract which is modified due to hidden...