Consumption Theory with Reference Dependent Utility

This paper presents a closed form consumption function for an individual when he derives utility from both his current and previous consumption and from the consumption of his relevant others. I show that the traditional definition of an individual's marginal propensity to consume (MPC) is too narrow. With existing knowledge we would call for a broader definition of the MPC that I coin as the individual's total MPC, which also takes into account the consumption change of the relevant others, and this affects that total MPC is smaller than the traditional MPC. <p>