... (1 971 ), Groves (1 977 ), Groves and Loeb (1 975 ) and Green and La¤ont (19 97) For an exposition of the standard optimal-income tax model go to Salanié (2003) The classic reference is Mirrlees (1 971 ), ... to Myerson (1 979 ) and to Dasgupta et al (1 979 ), Harris and Townsend (1981) On auctions see Klemperer (1999, 2002) and Vickrey (1961) For the key references on “tipping mechanisms” and their e¤ectiveness ... Table 12 .7, and it yields the following important result (For proof see Appendix C) Theorem 12 .7 (Clark-Groves) A scheme which (a) approves a project if and only if (12.29) is non-negative, and (b)...