Carroll and Kimball (1996) show that the consumption function for an agent with time-separable, isoelastic preferences is concave in the presence of income uncertainty. In this paper I show that concavity breaks down if we abandon time-separability. Namely, if an agent maximizing an isoelastic...

According to the German SAVE survey, more than 40 percent of households regularly save fixed amounts rather than flexibly adjusting savings to income variations as assumed by the Permanent Income Hypothesis (PIH). Fixed amount saving behaviour could thus imply a challenge to PIH-based standard...

Analyzing account-level data from an account aggregator, we find that households increase consumption when they receive (expected) tax refunds, as if they face liquidity constraints. However, these same households smooth consumption when making payments in other years, primarily by transferring...

This chapter reviews empirical estimates of differential income and consumption growth across individuals during recessions. Most existing studies examine the variation in income and consumption growth across individuals by sorting on ex ante or contemporaneous income or consumption levels. We...

This chapter 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...

This paper suggests a method for estimating the distribution of discount rates using panel data on income and wealth. Using the English Longitudinal Survey of Ageing (ELSA), a representative sample of the English popularion over age 50, we general panel date on total consumption from the...