Boom and Bust Cycle of the Stock Market, and Economic Growth in a Vintage Capital Model

We construct a growth model of overlapping generations with vintage capital. There exists an equilibrium that converges to the balanced growth path through endogenous fluctuations of investment, consumption, and output in terms of the growth rate. When the technological change arrives and a rise in productivity is embodied only in newly invested capital, the economy converges to a new balanced growth path with a higher growth rate of output, but when we interpret the price of existing old capital as the stock market capitalization, the rise in productivity is accompanied by an initial decline in the stock market. Oscillatory equilibria are supported as perfect-foresight equilibria in the present framework with finitely lived agents and capital. Any oscillatory equilibrium is associated with the regime switch from an economy with both young and old capital in use into one with only old capital in use.     

Macroscopic and microscopic statistical properties observed in blog entries

We observe the statistical properties of blogs that are expected to reflect social human interaction. Firstly, we introduce a basic normalization preprocess that enables us to evaluate the genuine word frequency in blogs that are independent of external factors such as spam blogs, server-breakdowns, increase in the population of bloggers, and periodic weekly behaviors. After this process, we can confirm that small frequency words clearly follow an independent Poisson process as theoretically expected. Secondly, we focus on each blogger’s basic behaviors. It is found that there are two kinds of behaviors of bloggers. Further, Zipf’s law on word frequency is confirmed to be universally independent of individual activity types.     

Land tax and economic growth under credit market imperfection

We study the general equilibrium effects of land taxation on economic growth by extending the model developed by Kiyotaki and Moore (1997) to an endogenous growth model, where land is used not only as an input of production but also as collateral. Land taxation tends to hamper economic growth through the credit-contraction effect, but the overall direction on economic growth depends on the redistribution scheme of the tax revenue. Surprisingly, we show that if the tax revenue is fully refunded to entrepreneurs, the economy grows faster than a no-taxation economy. We calibrate our model and show that if taxation on land is raised by 1 percent, the land price initially falls by approximately 9.09 percent, while the economy grows faster by 0.6%.     

The impact of technology shocks on the Japanese business cycle—An empirical analysis based on Japanese industry data

In order to investigate the impacts of technology shocks on the recent Japanese business cycles, we construct an aggregate technological measure from industry-based data. Our approach is to estimate production function by industry, by controlling for the returns to scale factor and unobserved factor utilization. We find that positive technology shocks result in a contraction of labor input on impact. This result implies that the standard real business cycle (RBC) model is not supported and the new Keynesian model or the labor reallocation model is a candidate to explain the Japanese business cycles. From further empirical studies, we find that the labor reallocation model is plausible for explaining the Japanese business cycles.     

Long-run Growth and Intragenerational Transfer Under Capital Market Imperfections

The purpose of this paper is to provide a long-run growth model linking growth to income distribution between lenders and borrowers in an environment where enforcement of loan contracts is imperfect. The equilibrium under costly verification implies a smaller growth rate, relative to the symmetric-information economy. Intra-generational transfer of income is shown to promote growth so long as the redistribution gives rise to an increase in net worth positions of borrowers.
JEL Classification Numbers: G21, O16, O40     

Redistribution Policies under Capital Market Imperfection

We establish the existence and stability of the long‐run wealth distribution in a credit constrained economy by applying the monotonicity condition developed by H. Hopenhayn and E. Prescott. There should emerge an egalitarian society in which all families experience upward and downward mobility, although a society of persistent inequality may occur in which rich entrepreneurs and poor lenders remain immobile between classes. The speed of transition from the latter to the former is shown to depend on the design of redistribution policies. Simulation results show that this occurs more rapidly when the government favours relatively rich lenders. JEL Classification Numbers: D31, G33, O12.     

Bank's capital structure under non-diversifiable risk

Summary. The aim of this paper is to study the design of optimal capital structure of a “large” intermediary when the intermediary faces a non-diversifiable risk, within the standard costly-state-verification (CSV) model. I demonstrate that, under weaker conditions, a “large” intermediary realizes more efficient allocation by issuing both debt and equity than by issuing only debt. Unlike Diamond (1984) and Williamson (1986), the set of optimal contracts involves ex ante monitoring made by shareholders of the intermediary. Changes in parameters, such as the variance of the aggregate risk or the cost of monitoring, affect bankruptcy costs and the capital structure. Received: October 12, 1998; revised version: March 20, 2001     

Land-Tax, Transfer and Growth in an Endogenously Growing Economy with Overlapping Generations

In this paper we investigate the effect of a tax on land rent on the growth rate of capital in a growing economy with overlapping generations. A tax on land rent has a potential to increase the growth rate of capital. If the model is extended to allow the tax revenue to be refunded to individuals, a tax on land rent may deter growth to the extent that the tax revenue is transferred to the older generation.
JEL Classification numbers: H31, O41.     

Fiscal sustainability in Japan

This paper investigates fiscal sustainability of Japan by providing a dynamic stochastic general equilibrium (DSGE) model that features the low interest rate of the government bond relative to the economic growth rate to mimic the actual data. We evaluate fiscal sustainability by investigating whether the expected path of the debt-to-GDP ratio stabilizes or increases without bound. The debt-to-GDP ratio depends crucially on the projected growth rate and the fiscal policy rule. If the government does not react to the current fiscal crisis, the debt-to-GDP ratio will increase without bound, and then the fiscal policy is not sustainable. If the fiscal rule uses Bohn’s (1998) idea that involves the response of the primary surplus to the debt, sustainability improves. This rule provides a useful and realistic reform plan in the short and long runs.     

Capital Flight, North-South Lending, and Stages of Economic Development

We present a two-country OLG economy in which international capital mobility exists in the presence of moral hazard in financial contracts. The difference in the extent of asymmetric information is a source of capital movement and capital flows from the South to the North. Even though there exists a unique steady state under autarky, multiple locally stable steady states may emerge in a world economy with an integrated capital market. However, the integration may drive the South down to further impoverishment. The South's government therefore should take into account seriously the timing of capital market liberalization as a conduit of economic development.