We estimate the intertemporal elasticity of substitution in consumption (IES) using a preannounced increase in Japan's consumption tax rate. Because this tax is highly comprehensive, the rate increase was announced prior to its implementation, and because other factors that affect the real interest rate were constant, the tax rate increase presents an ideal natural experiment to estimate the IES. A Japanese monthly household survey is exploited to accurately categorize nondurables, and our empirical specification addresses intratemporal substitution bias. We find that the IES is 0.21 and not significantly different from 0, but it is significantly less than 1.

This survey and report were prepared by the Consumer and Community Development Research Section of the Federal Reserve Board's Division of Consumer and Community Affairs (DCCA). DCCA directs consumer-and community-related functions performed by the Board, including conducting research on financial services policies and practices and their implications for consumer financial stability, community development, and neighborhood stabilization.

This study measures the effect of an increase in Japan's Value Added Tax rate on the timing of household expenditures and consumption, which do not necessarily coincide. The analysis finds that durable and storable expenditures surged in the month prior to the tax rate increase, fell sharply upon implementation, but quickly returned to their previous long-run levels. Non-storable non-durable expenditures increased slightly in the month prior to the tax rate increase, but were otherwise unresponsive. A dynamic structural model of household consumption reveals that the observed expenditure responses were driven by stockpiling behavior, the insensitivity of durable and non-durable consumption to a change in the real interest rate, and strong complementarities between durables and non-durables. The results suggest that salient intertemporal price variation may have a large, though highly transitory impact on household expenditures.