This paper proposes a new combinatorial auction protocol called Average-Max-Minimal-Bundle (AM-MB) protocol. The characteristics of the AM-MB protocol are as follows: (i) it is strategyproof, that is, truth-telling is a dominant strategy, (ii) the computational overhead is very low, since it allocates bundles greedily thereby avoiding an explicit combinatorial optimization problem, and (iii) it can obtain higher social surplus and revenue than can the Max-Minimal-Bundle (M-MB) protocol, which also satisfies (i) and (ii). Furthermore, this paper extends the AM-MB protocol to an open ascending-price protocol in which straight-forward bidding is an ex-post Nash equilibrium.
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