The problem of allocating bundles of indivisible objects without transfers arises in the assignment of courses to students, of computing resources like CPU time, memory and disk space to computing tasks and the truck loads of food to food banks. In these settings the complementarities in...

The problem of allocating bundles of indivisible objects without transfers arises in the assignment of courses to students, of computing resources like CPU time, memory and disk space to computing tasks and the truck loads of food to food banks. In these settings the complementarities in...

Centralized markets reduce the costs of search for buyers and sellers. Their ‘thickness' increases the chance of order execution at competitive prices. In spite of the incentives to consolidate, some markets, securities markets and online advertising, being the most notable, are fragmented...