2. From preferences to utility Preference Utility function rationality← exist X finite Desirability Increasing Continuity continuity C Quasi-concave invex Homothetic HD1 Quasi-linear Gorman form2.From preferences to utility Preference Utility function rationality exist X finite Desirability increasing Continuity continuity Convexity Quasi-concave Homothetic HD1 Quasi-linear Gorman form