OBJECTIVE To investigate whether people who buy wine buy healthier food items than those who buy beer. DESIGN Cross sectional study. SETTING Supermarkets in Denmark. Data Information on number, type of item, and total charge from 3.5 million transactions over a period of six months. RESULTS Wine buyers bought more olives, fruit and vegetables, poultry, cooking oil, and low fat cheese, mil...

Players may be allowed to both buy and sell the same commodity in a strategic market game. Any outcome of such a game can also be obtained as an outcome of a game in which players either buy or sell. We present a robust example to show that an equilibrium allocation of the buy and sell game may not be so in the corresponding buy or sell game as the set of achievable allocations for any player, ...

The essence of the simplest buy-at-bulk network design problem is buying network capacity "whole-sale" to guarantee connectivity from all network nodes to a certain central network switch. Capacity is sold with "volume discount": the more capacity is bought, the cheaper is the price per unit of bandwidth. We provide O(log 2 n) randomized approximation algorithm for the problem. This solves the ...