Edmund S. Crawley

I combine microdata on the intertemporal marginal propensity to consume with 10 structural macro shocks to identify the role of intertemporal substitution in consumption behavior. Although some of the structural shocks that I examine lead to large and persistent changes in real interest rates—which in many models would induce a large intertemporal substitution effect—I find no evidence that households shift the timing of their consumption in response to these interest rate changes. Indeed, changes to the expected path of income explain almost all the aggregate consumption response, leaving no role for intertemporal substitution.

Using a heterogeneous agent model calibrated to match measured spending dynamics over four years following an income shock (Fagereng et al. (2021)), we assess the effectiveness of three fiscal stimulus policies employed during recent recessions. Unemployment insurance (UI) extensions are the clear "bang for the buck" winner when effectiveness is measured in utility terms. Stimulus checks are second best and have two advantages (over UI): they arrive and are spent faster, despite being less targeted, and they are scalable to any desired size. A temporary (two-year) cut in the rate of wage taxation is considerably less effective than the other policies and has negligible effects in the version of our model without a multiplier.

The standard model of permanent and transitory income provides estimates that differ depending on the type of moments used---levels or differences---and the weighting matrix applied. We propose two changes to the standard model. First, we account for the time-aggregated nature of observed income data. Second, we allow transitory shocks to persist for varying lengths of time. With only one additional parameter, our proposed model consistently estimates the parameters of the income process irrespective of the moments and weighting matrix applied. We strongly advise against estimating the standard model using difference moments.

I show that the periodic and chaotic behavior exhibited by the two-sector Robinson-Solow-Srinivasan model in discrete-time is asymptotically irrelevant. If the discrete time interval is smaller than a critical limit, the qualitative properties of the model are the same as those in the continuous-time model.

We document heterogeneity in the marginal propensity to consume (MPC) across household characteristics relevant to understanding heterogeneous agent models and monetary policy transmission. We find a strong negative relationship between household liquid wealth and MPC. We show that household liquid wealth predicts MPC closely for every other household characteristic we look at. We use a new empirical method that overcomes sources of bias found in the existing literature, along with administrative data from Denmark that allow us to identify heterogeneous behavior. We use our results to analyze monetary policy transmission mechanisms in both Denmark and the United States.

To predict the effects of the 2020 U.S. CARES Act on consumption, we extend a model that matches responses of households to past consumption stimulus packages. The extension allows us to account for two novel features of the coronavirus crisis. First, during the lockdown, many types of spending are undesirable or impossible. Second, some of the jobs that disappear during the lockdown will not reappear when it is lifted. We estimate that, if the lockdown is short-lived, the combination of expanded unemployment insurance benefits and stimulus payments should be sufficient to allow a swift recovery in consumer spending to its pre-crisis levels. If the lockdown lasts longer, an extension of enhanced unemployment benefits will likely be necessary if consumption spending is to recover.

Macroeconomic models often invoke consumption "habits" to explain the substantial persistence of aggregate consumption growth. But a large literature has found no evidence of habits in microeconomic datasets that measure the behavior of individual households. We show that the apparent conflict can be explained by a model in which consumers have accurate knowledge of their personal circumstances but 'sticky expectations' about the macroeconomy. In our model, the persistence of aggregate consumption growth reflects consumers' imperfect attention to aggregate shocks. Our proposed degree of (macro) inattention has negligible utility costs, because aggregate shocks constitute only a tiny proportion of the uncertainty that consumers face.

In 1960, Working noted that time aggregation of a random walk induces serial correlation in the first difference that is not present in the original series. This important contribution has been overlooked in a recent literature analyzing income and consumption in panel data. I examine Blundell, Pistaferri and Preston (2008) as an important example for which time aggregation has quantitatively large effects. Using new techniques to correct for the problem, I find the estimate for the partial insurance to transitory shocks, originally estimated to be 0.05, increases to 0.24. This larger estimate resolves the dissonance between the low partial consumption insurance estimates of Blundell, Pistaferri and Preston (2008) and the high marginal propensities to consume found in the natural experiment literature. A remaining puzzle is the low estimate I recover for the partial insurance to permanent shocks.