We study the allocation of several heterogenous, commonly ranked objects to impatient agents with privately known characteristics who arrive sequentially according to a Poisson or renewal process. We analyze and compare the policies that maximize either welfare or revenue. We focus on two cases:...

We study the efficiency property of responsive pricing - a scheme first proposed by Vickrey - that increases prices as a function of capacity utilization. We show that although responsive pricing implements allocations that are arbitrarily close to market clearing, these allocations are not...