2. The rule of choice Choice construct: a choice under certain budget:(∞,C() Budget set: BaRand B≠andB∈B,isa budget family, represented a limited list of all possible choice under certain system, nature, technology and other social environments that the decision-maker must take Choice rule:C(B)∈B,forB∈B,C(.)≠ maybe contain more than one elements lectures for Chu Kechen Honors Collegelecture5 for Chu Kechen Honors College 2.The rule of choice ➢ Choice construct: a choice under certain budget: ⚫ Budget set: and , is a budget family, represented a limited list of all possible choice under certain system, nature, technology and other social environments that the decision-maker must take. ⚫ Choice rule: , maybe contain more than one elements. ( , (.)) B C B B    X and BB B C B B B ( ) ,for  B C(.)  