Macroeconomic Impact of Population Aging in Japan: A Perspective from an Overlapping Generations Model

Muto, Ichiro and Oda, Takemasa and Sudo, Nao (2012): Macroeconomic Impact of Population Aging in Japan: A Perspective from an Overlapping Generations Model.

Abstract

Due to a sharp decline in the fertility rate and a rapid increase in longevity, Japan's population aging is the furthest advanced in the world. In this study we explore the macroeconomic impact of population aging using a full-fledged overlapping generations model. Our model replicates well the time paths of Japan’s macroeconomic variables from the 1980s to the 2000s and yields future paths for these variables over a long horizon. We find that Japan’s population aging as a whole adversely affects GNP growth by dampening factor inputs. It also negatively impacts on GNP per capita, especially in the future, mainly due to the decline in the fraction of the population of working-age. For these findings, fertility rate decline plays a dominant role as it reduces both labor force and saver populations. The effects of increased longevity are expansionary, but relatively minor. Our simulations predict that the adverse effects will expand during the next few decades. In addition to closed economy simulations, we examine the consequences of population aging in a small open economy setting. In this case a decline in the domestic capital return encourages investment in foreign capital, mitigating the adverse effects of population aging on GNP.

• Item Type: MPRA Paper
• Language: English
• Keywords: Population Aging; Overlapping Generations Model; Capital Flow
• Subjects: E - Macroeconomics and Monetary Economics > E2 - Consumption, Saving, Production, Investment, Labor Markets, and Informal Economy > E20 - General; J - Labor and Demographic Economics > J1 - Demographic Economics > J11 - Demographic Trends, Macroeconomic Effects, and Forecasts

References

Arai, R., Ueda, J. (2012) “A Numerical Evaluation on a Sustainable Size of Primary Deficit in Japan”, KIER Discussion Paper Series, 823.

Auerbach, A., Kotlikoff, L. (1987) Dynamic Fiscal Policy, Cambridge University Press.

Braun, R. A., Ikeda, D., Joines, D. H. (2009) “The Saving Rate in Japan: Why It Has Fallen and Why It Will Remain Low”, International Economic review, 50, 291-321.

Braun, R. A., Joines, D. H. (2012),�”The Implications of a Greying Japan for Public Policy”, mimeo.

Chen, K., Imrohoroglu, A., Imrohoroglu, S. (2007) “The Japanese Saving Rate between 1960 and 2000: Productivity, Policy Changes, and Demographics”, Economic Theory, 32, 87-104.

Chen, K., Imrohoroglu, A., Imrohoroglu, S. (2009) “A quantitative assessment of the decline in the U.S. current account”, Journal of Monetary Economics, 56, 1135-1147.

Dekle, R. (2000) “Demographic density, per capita consumption, and the Japanese saving-investment balance,” Oxford Review of Economic Policy, 16 (2), 46-60.

Dekle, R. (2003) “Japan’s Fiscal Policy and Debt Sustainability”, in Structural Impediments to Growth in Japan, Blomstrom et al. (eds.), University of Chicago Press.

Ferrero, A. (2010) “A structural decomposition of the U.S. trade balance: Productivity, demographics and �fiscal policy”, Journal of Monetary Economics, 57(4), 478-490.

Fujiki, H., Hirakata, N., Shioji, E. (2012) �”Aging and Household Stock Holdings: Evidence from Japanese Household Survey Data”, mimeo.

Hansen, G. D., Imrohoroglu, S. (2012) “Fiscal Reform and Government Debt in Japan: A Neoclassical Perspective”, mimeo.

Hayashi, F., Prescott, E. (2002) “The 1990s in Japan: A Lost Decade,” Review of Economic Dynamics, 5, 206-235.

Horioka, C. (1997) “A Cointegration Analysis of the Impact of the Age Structure of the Population on the Household Saving Rate in Japan,”�Review of Economics and Statistics, 79, 511-516.

Horioka, C., Watanabe, W. (1997) “Why Do People Save? A Micro-Analysis of Motives for Households Saving in Japan,” Economic Journal, 107, 537-552.

Ihori, T., Kato, R., R., Kawade, M., Bessho, S. (2005) “Public Debt and Economic Growth in an Aging Japan,”�CARF F-Series CARF-F-046, Center for Advanced Research in Finance, Faculty of Economics, The University of Tokyo.

Ihori, T., Kato, R., R., Kawade, M., Bessho, S. (2011) “Health Insurance Reform and Economic Growth: Simulation Analysis in Japan,” Japan and the World Economy, 23, 227-239.

Ikeda, D., Saito, M. (2012) “The Effects of Demographic Changes on the Real Interest Rate in Japan,”�Bank of Japan Working Paper Series, 12-E-3.

Imrohoroglu, S., Kitao, S. (2009) “Labor Supply Elasticity and Social Security Reform,” Journal of Public Economics, 93, 867-878.

Imrohoroglu, S., Sudo, N. (2011a) “Productivity and Fiscal Policy in Japan: Short Term Forecasts from the Standard Growth model,”�Monetary and Economic Studies, 29, 73-106.

Imrohoroglu, S., Sudo, N. (2011b) �”Will a Growth Miracle Reduce Debt in Japan?” IMES Discussion Paper Series, 2011-E-1, Bank of Japan.

Koga, M. (2006) “The Decline of Japan’s Saving Rate and Demographic Effects,” Japanese Economic Review, 2, 312-321.

Kozu, T., Sato, Y., Inada, M. (2003) “Demographic Changes in Japan and their Macroeconomic Effects,” Bank of Japan Working Paper Series, 04-E-6.

Maddaloni, A., Musso, A., Rother, P., Ward-Warmedinger, M., Westermann, T. (2006) “Macroeconomic implications of demographic developments in the euro area,” European Central Bank Occasional Paper Series, 51.

Miles, D. (1999) “Modelling the Impact of Demographic Change upon the Economy,” Economic Journal, 109, 1-36.

Oguro, K., Shimasawa, M. (2011) Matlab Niyoru Macro Keizai Model Nyuumon, Nippon Hyouron-Sha.

Trabandt, M., Uhlig, H. (2011) “The Laffer Curve Revisited,”� Journal of Monetary Economics, 58, 305-327.