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AbstractWe argue that the U.S. personal saving rate's long stability (from the 1960s through the early 1980s), subsequent steady decline (1980s2007), and recent substantial increase (20082011) can all be interpreted using a parsimonious`buer stock' model of optimal consumption in the presence of labor income uncertainty and credit constraints. Saving in the model is aected by the gap between`target' and actual wealth, with the target wealth determined by credit conditions and uncertainty. An estimated structural version of the model suggests that increased credit availability accounts for most of the saving rate's long-term decline, while uctuations in net wealth and uncertainty capture the bulk of the business-cycle variation. 1
Non-technical SummaryThe remarkable rise in personal saving during the Great Recession has sparked fresh interest in the determinants of saving decisions. In the United States, for example, the increase in household saving since 2007 was generally sharper than after any other postwar recession, and the personal saving rate has remained well above its pre-crisis value for the past ve years. While the saving rise partly reected a decline in spending on durable goods, spending on nondurables and services was also unprecedentedly weak.Carroll ( This paper aims to quantify these three channels, both over the long span of historical experience and for the period since the beginning of the Great Recession.To x ideas, the paper begins by presenting a tractable`buer stock' saving model with explicit and transparent roles for each of the inuences emphasized above (the precautionary, wealth, and credit channels). The model's key intuition is that, in the presence of income uncertainty, optimizing households have a target wealth ratio that depends on the usual theoretical considerations (risk aversion, time preference, expected income growth, etc), and on two features that have been harder to incorporate into analytical models:The degree of labor income uncertainty and the availability of credit. Our model yields a tractable analytical solution that can be used to calibrate how much saving should go up in response to an increase in uncertainty, or a negative shock to wealth, or a tightening of liquidity constraints.We highlight one particularly interesting implication of the model: In response to a permanent worsening in economic circumstances (such as a permanent increase in unemployment risk), consu...