9. See, e.g., Gellhorn, Contracts and Public Policy, 35 Colum. L. Rev. 679, 683-84 (1935); C. Kaysen & D. Turner, Antitrust Policy: An Economic and Legal Analysis 235 (1959); Perillo, Restitution in a Contractual Context, 73 Colum. L. Rev. 1208 (1973). On the development of promissory estoppel as an alternative contract cause of action through which damages can be recovered without compliance with formal requirements, see G. Gilmore, The Death of Contract 66, 90 (1974).