Heterogeneity and Aggregation
这篇综述探讨了消费者需求、消费增长与财富、劳动参与和工资三个领域中的加总问题，重点处理个体层面的异质性和非线性，并展示如何用实证数据解决加总难题。
This survey covers recent solutions to aggregation problems in three application areas, consumer demand analysis, consumption growth and wealth, and labor participation and wages. Each area involves treatment of heterogeneity and nonlinearity at the individual level. Three types of heterogeneity are highlighted: heterogeneity in individual tastes, heterogeneity in income and wealth risks and heterogeneity in market participation. Work in each area is illustrated using results from empirical data. The overall aim is to show how concerns faced by empirical researchers regarding aggregation can be addressed.