“…There will still be some mention to them in speci…c contexts where the boundaries are hard to establish, as in the analysis of assignment and cost sharing models (see Sections 9.3 and 9.4. But I exclude very important and extensive work on public goods allocation, in the line of Vickrey (1960), Groves (1973), Groves and Loeb (1975), Green and La¤ont (1979), or Roberts (1979), and also ignore the very relevant subject of auctions, where economists and, more recently, computer scientists as well, have examined a host of questions related to incentives, in general, and to strategy-proofness in particular.…”