Effects of Transparency in Procurement Practices on Government Expenditure: A Case Study of Municipal Public Works

This paper examines the effect of improved transparency in the bidder qualification process, using the experience gained from a case study of municipal public works auctions. A difference-in-differences analysis reveals that improved transparency reduces procurement cost by up to 8%. This finding is robust with regard to the concerns of both endogeneity and sample selectivity. The bidding-function estimates, combined with features of Japanese procurement system, imply that the introduction of transparent practices is insufficient to bring about efficiency in public procurement.      

Portfolio Optimization under Lower Partial Risk Measures

Portfolio management using lower partial risk (downside risk) measures is attracting more attention of practitioners in recent years. The purpose of this paper is to review important characteristics of these riskmeasures and conduct simulation using four alternative measures, lower semi-variance, lower semi-absolute deviation, first order below targetrisk and conditional value-at-risk.We will show that these risk measures are useful to control downside risk whenthe distribution of assets is non-symmetric. Further, we will propose a computational scheme to resolve the difficultyassociated with solving a large dense linear programming problems resulting from these models. We will demonstrate that this method can in fact solve problems consisting of10⁴ assets and 10⁵ scenarios within a practical amount of CPU time.     

Sources of Productivity Growth Dynamics: Is Japan Suffering From Baumol's Growth Disease?

This study examines the sources of labor productivity growth dynamics in Japan (1970–2010) and investigates the extent to which Japanese economic performance has been affected by Baumol's growth disease (BGD). We find that BGD silently undermines Japanese economic growth. However, the magnitude is miniscule, and consequently the aggregate labor productivity growth rate has not been decreasing monotonically. We also explore how BGD is arising and why it is small in the Japanese economy. BGD is weak because (1) the positive Baumol growth effect is also working in certain services sectors and (2) BGD is not a durable phenomenon: even if a sector begins to suffer from BGD, it is likely to recover quickly.     

市场化进程中社会资本还能够充当保险机制吗?——中国农村家庭灾后消费的经验研究

本文研究了在中国农村的市场化过程中,社会资本为遭受自然灾害的家庭的消费平滑提供保险的作用。我们基于2002年中国家庭收入调查(CHIPS)的农村数据进行经验研究,结果显示,互助、公民参与及信任这三种社会资本并没能帮助中国农村家庭抵御自然灾害对于消费的冲击。我们的发现并不依赖于同村家庭遭受自然灾害的同质性程度。我们进一步找到证据表明:社会资本在帮助农户分担风险和平滑消费上的作用随着市场化的深入而减弱。     

Increasing marginal costs and satiation in the private provision of public goods: group size and optimality revisited

It is widely recognized that the degree of inefficiency in the voluntary provision of a public good increases with the group size of an economy. However, we find that only a slight modification in the conventional assumptions gives rise to a profound difference in outcome. In particular, we show that there is a case where the Nash equilibrium provision and the efficient provision will converge as the size of an economy grows. To show this, we assume individuals face increasing marginal cost of voluntary provision and their preference function has a finite satiety point.      

Price Effects of Target Ratcheting: A Progress Report on Medical Devices

Regulators, who have asymmetric information concerning the technology of regulated firms, often rely on incentive‐based regulation. While such a scheme is well known to be vulnerable to the adverse incentives of regulated firms, empirical research that quantifies the magnitude of distortion caused by incentive regulation is scarce. This paper is a progress report of our recent project on target ratcheting with an application to medical devices in Japan. A casual observation of detailed product‐level transaction data and reduced‐form analyses indicate the existence of pricing distortion in the wholesale market. The paper also proposes a two‐period bilateral bargaining model to match the data. A preliminary analysis finds evidence consistent with the hypothesis that target ratcheting distorts the pricing of regulated firms, but the magnitude of the distortion is estimated to be economically small.