A multi-item single-period stochastic inventory model is formulated in the fuzzy environment with budgetary, floor-space constraints. In this model, probabilistic demand is related to the unit selling price. Here fuzziness is introduced in both the objective function and constraint goals. The problem is solved using the fuzzy nonlinear technique for linear membership functions. The model is ill...

This paper examines the effects of introducing and removing short sale constraints and margin requirements on a stock market using a multiagent simulation model. We focused on the influence of these kinds of restrictions on daily price volatility and on traders long-run wealth distribution. We performed analysis both in a closed market and in an open market, where there is random cash inflow or...

This paper is concerned with some feasibility issues in mathematical programs with equilibrium constraints (MPECs) where additional joint constraints are present that must be satis ed by the state and design variables of the problems. We introduce su cient conditions that guarantee the feasibility of these MPECs. It turns out that these conditions also guarantee the feasibility of the quadratic...

Over the past few years, firms in the travel and entertainment industries have begun using novel sales strategies for revenue management. In this chapter, we study a selling strategy called opaque selling, in which firms guarantee one of several fully specified products, but hide the identity of the product that the consumer will actually obtain until after the purchase is completed. Several fi...

This article reviews the basic concepts and techniques of time management as they relate to a medical lifestyle. Essential tools are described to help the physician reassess and sharpen skills for handling intensifying demands and constraints of juggling patient care, research, teaching, and family responsibilities. The historical background and principles of time management for three popular "...

We obtain closed–form expressions for the prices and optimal hedging strategies of American put–options in the presence of an “up–and–out” barrier, both with and without constraints on the short–selling of stock. The constrained case leads to a stochastic optimization problem of mixed optimal stopping/singular control type. This is reduced to a variational inequality which is then solved explic...

We consider the problem of optimally determining an investment portfolio for an energy company owning a network of gas pipelines, and in charge of purchasing, selling and distributing gas. We propose a two stage stochastic investment model which hedges risk by means of Conditional Value at Risk constraints. The model, solved by a decomposition method, is assessed on a real-life case, of a Brazi...

Assignment Auctions Paul Milgrom April 10, 2008 Abstract. We propose a new auction for selling goods that are close substitutes. The design is a direct mechanism that is compact, easy to implement, respects integer constraints, and is a “tight” simplification of a standard direct competitive mechanism. Connections are established between the assignment auction and the Vickrey auction, the unifo...