To date, the largest part of literature on multi-unit auctions has assumed that there are k homogeneous objects being auctioned, where each bidder wishes to win exactly one of all of k units. These modeling assumptions have made the examination of ordering in sequential auctions inconsequential. The aim of this paper is to introduce and highlight the critical influence that ordering can have on the efficiency of an auction. We study a buyer who outsources via sequential 2nd-price auctions two heterogeneous jobs, and faces a diverse set of suppliers with capacity constraints.
