A cointegrated commodity pricing model

We propose a commodity pricing model that extends the Gibson–Schwartz two‐factor model to incorporate the effect of linear relations among commodity spot prices, and provide a condition under which such linear relations represent cointegration. We derive futures and call option prices for the proposed model, and indicate that, unlike in Duan and Pliska (2004), the linear relations among commodity prices should affect commodity derivative prices, even when the volatilities of commodity returns are constant. Using crude oil and heating oil market data, we estimate the model and apply the results to the hedging of long‐term futures using short‐term ones.     

Platform strategy of video game software in Japan, 1984–1994: theory and evidence

This paper analyzes a model of platform competition in markets of system products composed of hardware and complementary software, with a specific focus on exclusive contracting. When hardware products are strongly differentiated, or when consumers value the marginal benefit of additional software variety highly, we find that, in equilibrium, hardware firms will engage in exclusive contracting of software development. This finding is strongly supported by our empirical results in the Japanese home video game industry, dominated by Nintendo from 1984 to 1994. Copyright © 2010 John Wiley & Sons, Ltd.     

The effect of collaboration network on inventors' job match,productivity and tenure

It has been argued in the economic literature that job search through informal job networks improves the employer–employee match quality. This paper argues that inventors' research collaboration networks reduce the uncertainty of firms about the match qualities of inventors prior to hiring. We estimate the effect of inventors' collaboration networks on their productivity and mobility using the U.S. patent application database. It is found that networked inventors are more productive and have longer tenure than non-networked inventors. The evidence from fixed-effect regressions shows that the higher productivity and longer tenure of networked inventors are not solely attributable to unobserved ability of inventors or unobserved characteristics of firms. These results are consistent with the job match hypothesis between inventors and firms through their collaboration networks.     

Asset price fluctuations in Japan: 1980–2000

In this paper, we try to account for the recent fluctuations in asset prices in Japan using a dynamic stochastic general equilibrium model. In our model, a key to explain the land-price fluctuation is how people's expectations about future productivity growth evolve over time. Specifically, by assuming adaptive learning on the growth rate of productivity, our model can replicate the Japanese land-price fluctuations over the period 1980–2000. However, even with adaptive learning, habit persistence, and costly capital accumulation, a substantial portion of the stock-price fluctuation is left unexplained, and a puzzle remains.     

Causality-in-mean and causality-in-variance among electricity prices,crude oil prices,and yen–US dollar exchange rates in Japan

In this study, we test the Granger-causality-in-mean and Granger-causality-in-variance among electricity prices, crude oil prices, and yen-to-US-dollar exchange rates in Japan using a cross-correlation function approach. We find Granger-causality-in-mean from neither the exchange market nor the oil market to the power market; the same was true of Granger-causality-in-variance, although both the exchange rates and oil prices greatly influence power generation costs in Japan. We suspect the efficiency of this market is at play.     

HOME EQUITY IN RETIREMENT

Retired homeowners dissave more slowly than renters, which suggests that homeownership affects retirees' saving decisions. We investigate empirically and theoretically the life-cycle patterns of homeownership, housing, and nonhousing assets in retirement. Using an estimated structural model of saving and housing decisions, we find first that homeowners dissave slowly because they prefer to stay in their house as long as possible but cannot easily borrow against it. Second, the 1996–2006 housing boom significantly increased homeowners' assets. These channels are quantitatively significant; without considering homeownership, retirees' net worth would be 28%–44% lower, depending on age.     

The Foreign Exchange Origins of Japan's Economic Slump and Low Interest Liquidity Trap

Japan's macroeconomic problem has yet to be properly diagnosed. Throughout the 1990s, policy makers could not decide on the proper macro economic measures to combat the country's severe economic slump. We propose a unified explanation, with deep historical roots, of why aggregate private demand failed to recover after Japan's stock and real estate bubbles burst in 1991 and deflationary pressure continues. The problem is not purely ‘made in Japan’. It arises from Japan's unbalanced mercantile relationship with the United States. Starting in the early 1970s, numerous trade disputes between the two countries created tensions that were (temporarily) resolved by the yen going ever higher against the dollar up to 1995. In the last two decades, this persistent pressure for the yen to rise was further aggravated by Japan's large current‐account (saving) surpluses as the counterpart of America's large current account (saving) deficits. The legacy is the expectation that trade and financial tensions will recur so that the yen will be higher 10, 20, or 30 years from now –with Japan's (wholesale) price level forced correspondingly lower and nominal interest rates on yen assets remaining more than four percentage points less than those on dollar assets. This fear of yen appreciation, whose timing is erratic and unpredictable, now inhibits private domestic investment by both Japanese firms and households. Our theory also explains why, in the late 1990s, nominal interest rates on short‐term yen assets were compressed toward zero so as to destroy the normal profit margins of the banking system. In this liquidity trap, the Bank of Japan –whose monetary policy has been quite ‘expansionary’–is powerless to stimulate the flagging economy. To spring the liquidity trap, eliminate deflationary pressure, and restore macro economic balance in Japan, the American and Japanese governments must act jointly to quash the expectation that the yen will be higher in the future than it is today.     

A polyhedral approximation approach to concave numerical dynamic programming

This paper introduces a numerical method for solving concave continuous state dynamic programming problems which is based on a pair of polyhedral approximations of concave functions. The method is globally convergent and produces computable upper and lower bounds on the value function which can in theory be made arbitrarily tight. This is true regardless of the pattern of binding constraints, the smoothness of model primitives, and the dimensionality and rectangularity of the state space. We illustrate the method's performance using an optimal firm management problem subject to credit constraints and partial investment irreversibilities.