“What promises does the law enforce? The law enforces promises that people expect to be enforced. Why do people expect a particular kind of promise to be enforced? Because those are the ones the courts have always enforced.” ~ Angela Swan, Nicholas C Bala & Barry J Reiter, Contracts: Cases, Notes & Materials 8th ed (LexisNexis, 2010) at 257.
At least the authors of the text preface this with: “There is a kind of circular argument.” Contract Law is FUNNY FUNNY STUFF! (No, really …)