Accounting for observed fluctuations in aggregate employment, consumption, and real wage using the optimality conditions of a representative household requires preferences that are incompatible with economic priors. In order to reconcile theory with data, we construct a model with heterogeneous agents whose decisions are difficult to aggregate because of incomplete capital markets and the indivisible nature of labor supply. If we were to explain the model-generated aggregate time series using decisions of a stand-in household, such a household must have a nonconcave or unstable utility as is often found with the aggregate US data.
American Economic Journal: Macroeconomics
American Economic Association
An, Sungbae; Chang, Yongsung; and Kim, Sun-Bin.
Can a Representative Agent Model Represent a Heterogeneous Agent Economy?. (2008). American Economic Journal: Macroeconomics. 1, (2), 29-54. Research Collection School Of Economics.
Available at: http://ink.library.smu.edu.sg/soe_research/543