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We document that, at business cycle frequencies, fluctuations in nominal variables, such as aggregate price levels and nominal interest rates, are substantially more synchronized across countries than fluctuations in real output. To the extent that domestic nominal variables are determined by domestic monetary policy, and central banks generally attempt to keep the domestic nominal environment stable, this might seem surprising. We ask if a parsimonious international business cycle model can account for this aspect of cross-country aggregate fluctuations. It can. Due to spillovers of technology shocks across countries, expected future responses of national central banks to fluctuations in domestic output and inflation generate movements in current prices and interest rates that are synchronized across countries even when output is not. Even modest spillovers produce cross-country correlations such as those in the data.
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We consider the causes of international capital flows. Since capital flows are extremely persistent, we argue that their drivers must be persistent, too. We think the most compelling candidates are demographic trends, tfp differences and financial frictions. In this paper we focus primarily on the role of demography in a multi-country overlapping generations model in which saving decisions are tied to agents' life expectancy. Capital flows reflect differences between saving and investment across countries. Demographic changes affect the aggregate accumulation of assets in two ways: by changing life expectancy which changes individual household saving behavior, and by changing the age distribution of the population by which individual household decisions are aggregated. The most important drivers turn out to be increases in life expectancy caused by decreases in adult mortality.We use a quantitative version of the model to illustrate the impact of demography on capital flows and net foreign assets in China, Germany, Japan, and the United States.
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Emerging markets exhibit high returns to capital, the 'Lucas Paradox,' alongside volatile growth rate regimes. We investigate the role of long-run risks, i.e., risk due to fluctuations in economic growth rates, in leading to return differentials across countries. We take the perspective of a US investor and outline an empirical strategy to identify risky growth shocks and quantify their implications. Long-run risks account for 60-70% of the observed return disparity between the US and a group of the poorest countries. At the individual country level, our model predicts average returns that are highly correlated with those in the data (0.61).
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With US trade and current account deficits approaching 6% of GDP, some have argued that the country is "on the comfortable path to ruin" and that the required "adjustment'' may be painful. We suggest instead that things are fine: although national saving is low, the ratios of household and consolidated net worth to GDP remain high. In our view, the most striking features of the world at present are the low rates of investment and growth in some of the richest countries, whose surpluses account for about half of the US deficit. The result is that financial capital is flowing out of countries with low investment and growth and into the US and other fast-growing countries. Oil exporters account for much of the rest.
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Despite enormous growth in international capital flows, capital-output ratios continue to exhibit substantial heterogeneity across countries. We explore the possibility that taxes, particularly corporate taxes, are a significant source of this heterogeneity. The evidence is mixed. Tax rates computed from tax revenue are inversely correlated with capital-output ratios, as we might expect. However, effective tax rates constructed from official tax rates show little relation to capital -- or to revenue-based tax measures. The stark difference between these two tax measures remains an open issue.
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We consider the causes of international capital flows. Since capital flows are extremely persistent, we argue that their drivers must be persistent, too. We think the most compelling candidates are demographic trends, tfp differences and financial frictions. In this paper we focus primarily on the role of demography in a multi-country overlapping generations model in which saving decisions are tied to agents' life expectancy. Capital flows reflect differences between saving and investment across countries. Demographic changes affect the aggregate accumulation of assets in two ways: by changing life expectancy which changes individual household saving behavior, and by changing the age distribution of the population by which individual household decisions are aggregated. The most important drivers turn out to be increases in life expectancy caused by decreases in adult mortality.We use a quantitative version of the model to illustrate the impact of demography on capital flows and net foreign assets in China, Germany, Japan, and the United States.
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