We consider a firm that sells products that arrive over time to a buyer. We study this problem under a notion we call positive commitment, where the seller is allowed to make binding positive promises to the buyer about items arriving in the future, but is not allowed to commit not to make...

Billions of dollars worth of display advertising are sold via contracts and deals. This paper is the first formal study of preferred deals, a new generation of contracts for selling online advertisement that generalize the traditional reservation contracts; these contracts are suitable for...