Structure Utility function(效用函数 Definition Monotonic transformation(单调转换) Examples of utility functions and their indifference curves Marginal utility(边际效用) Marginal rate of substitution边际替代率 MRS after monotonic transformationStructure Utility function (效用函数） – Definition – Monotonic transformation （单调转换） – Examples of utility functions and their indifference curves Marginal utility （边际效用） Marginal rate of substitution 边际替代率 – MRS after monotonic transformation