re more abstract than necessary. They depend on assumptions that are highly unlikely to occur in practical situations, which are often less formal and rigid. Nonetheless, we discuss several significant steps toward offering more practical advice. Key words: bidding theory; practical auction design; combinatorial auctions. History: This paper was refereed. Michael H. Rothkopf (May 20, 1939
Ronald M. Harstad, Aleksandar Sasa Pekec