In this paper data from the 1985 Japanese Population Census are used to measure 'excess' commuting among 211 origin and destination points in the Tokyo Metropolitan Area. Using an approach developed by Hamilton, it is found that about 90 per cent of commuting time in Tokyo is excess. Using White's method only about 15 per cent of commuting time is excess. Sensitivity analyses reveal that the results are not very sensitive to the major assumptions of the analyses. The findings are compared and contrasted with Small and Song's results for the Los Angeles metropolitan area. Several simulations are used to examine the effect of decentralisation of employment on commuting behaviour and it is found that commuting time could be significantly reduced by decentralising jobs or centralising workers.
In this paper we examine the effect of public investment on the regional economies of Japan. The efficient policy for regional allocation of public capital is to invest in highly productive regions, whereas the actual policy pursues equity goals by allocating more public investment to depressed regions. We determine the effects of this equity- oriented allocation by estimating the aggregate regional production function and calculating the productivity of public capital stock for each region, using a cross-sectional time-series data set. Our results show that the marginal productivity of public capital has recently declined in most depressed regions, whereas the productivity in developed regions (e.g., Tokyo, Osaka) has increased slightly. We compare alternative policies of allocating public investment and their effects on the regional and national economies using numerical simulations. We then quantitatively describe the trade-off between the efficient and the equitable allocation of public investment. Copyright 2000 Blackwell Publishers
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