Aging, pension reform, and capital flows: A multi-country simulation model

In this paper, we present a quantitative analysis of the international capital flows induced by differences in population aging processes across countries and by pension reforms. In the vast majority of countries, demographic change will continue well into the 21st century. It is well known that within each country, demographic change alters the time path of aggregate savings, even more so in countries where fundamental pension reforms and shifts towards more pre-funding are implemented. While the patterns of population aging are similar in most countries, the timing differs substantially, in particular between industrialized and less developed countries. To the extent that capital is internationally mobile, population aging will therefore induce capital flows between countries. In order to quantify these effects, we develop a stylized multi-country overlapping generations model, and we use long-term demographic projections for several world regions to simulate international capital flows over a 50 year horizon. Our simulations suggest that capital flows from fast-aging industrial countries such as Germany to the rest of the world will be substantial. Closed-economy models of pen-sion reform are likely to miss quantitatively important effects of international capital mobility.

Aging and International Capital Flows

Throughout the world, population aging is a major challenge that will continue well into the 21st century. While the patterns of the demographic transition are similar in most countries, timing differs substantially, in particular between industrialized and less developed countries. To the extent that capital is internationally mobile, population aging will therefore induce capital flows between countries. In order to quantify these international capital flows, we employ a multi-country overlapping generations model and combine it with long-term demographic projections for several world regions over a 50 year horizon. Our simulations suggest that capital flows from fast-aging industrial countries (such as Germany and Italy) to the rest of the world will be substantial. Closed-economy models of pension reform are likely to miss quantitatively important effects of international capital mobility.

Aging and Asset Prices

This study quantifies the potential effects of aging on asset prices using a sophisticated overlapping generations (OLG) model with international diversification reflecting the global nature of capital markets. We show that the expected decline in the returns to capital will depend on the degree of international diversification. In the case of optimal diversification within the EU returns will drop by around one percentage point until 2035. The increasing risk aversion of an aging society will lead to differential effects on the returns on stocks and on bonds. We estimate the equity premium to rise by around 70 base points over the next 25 years. The sector that will be affected most by the demographic trend will be returns on real estate, however, only in the very long term. The main insight is that household size lags population size by about 20 years. One reason is that an older society features a smaller household size and thus, ceteris paribus, more households. Hence, housing demand will only begin to fall from 2025 onwards even if populations start declining today. Taken all evidence together, capital markets are not immune to demography. Rates of return will decline in response to demographic forces, but only very moderately. There is no scientific reason to assume that a major “asset meltdown” will occur when the babyboom generation retires.

Aging, Pension Reform, and Capital Flows:

We present a quantitative analysis of the effects of population aging and pension reform on international capital markets. First, demographic change alters the time path of aggregate savings within each country. Second, this process may be amplified when a pension reform shifts old-age provision towards more pre-funding. Third, while the patterns of population aging are similar in most countries, timing and initial conditions differ substantially. Hence, to the extent that capital is internationally mobile, population aging will induce capital flows between countries. All three effects influence the rate of return to capital and interact with the demand for capital in production and with labor supply. In order to quantify these effects, we develop a computational general equilibrium model. We feed this multi-country overlapping generations model with detailed long-term demographic projections for seven world regions. Our simulations indicate that capital flows from fast-aging regions to the rest of the world will initially be substantial but that trends are reversed when households decumulate savings. We also conclude that closed-economy models of pension reform miss quantitatively important effects of international capital mobility.25 August, 2004

Projection methods and scenarios for public and private pension information

Public pensions - the primary pillar of old-age income provision - will, in the future, be less generous than they have been in the past, in particular owing to the impact of demographic change. The pension gap is supposed to be plugged by the second and third pillars of pension provision. However, people require reliable planning information if they are to exercise greater individual responsibility. It is therefore absolutely essential that adequate information is made available about the level of pension benefits that will be generated by each pillar of old-age pension provision. This paper outlines a number of different means of presenting the level of future pensions and the assumptions on which such extrapolations are necessarily based. Our work is based on an assumed average rate of inflation of 1.5% and an average rate of real income growth not exceeding 1.5%. This last figure is derived from calculations made in the framework of a macroeconomic simulation model. This model also shows that while the funded pillar of old-age pension provision is not entirely immune to population aging, it is not substantially threatened by a substantial decrease in stock market prices, the so-called "asset meltdown".

Projection methods and scenarios for public and private pension information

Public pensions – the primary pillar of old-age income provision – will, in the future, be less generous than they have been in the past, in particular owing to the impact of demographic change. The pension gap is supposed to be plugged by the second and third pillars of pension provision. However, people require reliable planning information if they are to exercise greater individual responsibility. It is therefore absolutely essential that adequate information is made available about the level of pension benefits that will be generated by each pillar of old-age pension provision. This paper outlines a number of different means of presenting the level of future pensions and the assumptions on which such extrapolations are necessarily based. Our work is based on an assumed average rate of inflation of 1.5% and an average rate of real income growth not exceeding 1.5%. This last figure is derived from calculations made in the framework of a macroeconomic simulation model. This model also shows that while the funded pillar of oldage pension provision is not entirely immune to population aging, it is not substantially threatened by a substantial decrease in stock market prices, the so-called “asset meltdown”.

Demographic change, relative factor prices, international capital flows, and their differential effects on the welfare of generations

Demographic change has differential impacts on the welfare of current and future generations. In a simple closed economy, aging -- a relative scarcity of young workers -- increases wages, increasing the welfare of the young. At the same time, population aging will reduce rates of return to capital, thereby reducing the welfare of asset holders who are usually older than the population average. In a global world with pension systems, however, these effects are less straightforward, since international capital flows dampen the factor price changes. Moreover, pay-as-you-go pension systems financed by payroll taxes create a wedge between net and gross wages, and their intergenerational redistribution has important additional effects on the welfare of generations. To quantify these effects, we develop a large-scale multi-country overlapping generations model with uninsurable labor productivity and mortality risk. Due to the predicted relative abundance of the factor capital, the rate of return falls between 2005 and 2050 by roughly 90 basis points. Our simulations indicate that capital flows from rapidly ageing regions to the rest of the world will initially be substantial, but that trends are reversed when households de-cumulate savings. In terms of welfare, our model suggests that young individuals with little assets and currently low labor productivity indeed gain from higher wages associated with population aging. Older, asset-rich households tend to loose because of the predicted decline in real returns to capital