六西格玛管理活动中领导的重要性

序言 众所周知,企业或组织的高层领导（Champion）在企业推进六西格玛活动中起到非常重要的作用。首先,组织的高层领导要明确企业或组织的目标,并将为了实现这些目标而要完成的重要课题（CTQ．Critical to Quality）进行分解,与资深黑带（Master Black Belt）和黑带（Black Belt）一起制定CTQ的向下分解树型图（CTQ-Drill Down Tree）。     

Determinants of Underwriting Fees by New Entrant Banks: Evidence from the Japanese IPO Underwriting Market

This research investigates how banks expand market share after entering the underwriting market by examining the relation between commercial bank equity investments and underwriting fees. First, we find that not only bank underwriters with private information about issuers but also those without private information discount their fees, especially for smaller and riskier firms. This result is robust when using multiple firm‐bank relationship measures or when changing the investing stage. This is consistent with the strategic discount view that predicts that bank underwriters discount fees to expand bank market shares in underwriting markets.     

Monetary Policy, Credit, and Real Activity: Evidence from the Balance Sheet of Japanese Firms

We analyze the mechanism of monetary transmission in the Japanese economy by using the quarterly time series data disaggregated by firm size. In particular we examine the channels through which monetary policy influences the firm's fixed investment with special focus on the firm's land. We estimate the vector autoregressive model where we encompass two competing hypotheses on the monetary transmission: monetary and credit channels. Our evidence is in support of the credit channel. We find that land has played a vital role in the monetary transmission, especially for small firms. Moreover, we find that fall of land value in 1990s weakened the efficacy of monetary policy considerably. J. Japan. Int. Econ., December 2000, 14(4), pp. 385–407. Institute of Social and Economic Research, Osaka University, Osaka, Japan Copyright 2000 Academic Press.Journal of Economic Literature Classification Numbers: E22, E32, E44, E51.     

Stochastic optimal growth with nonconvexities

This paper studies optimal investment and dynamic behavior in stochastically growing economies. We assume neither convex technology nor bounded support of the productivity shocks. A number of basic results concerning the investment policy and the Ramsey–Euler equation are established. We also prove a fundamental dichotomy pertaining to optimal growth models perturbed by standard econometric shocks: either an economy is globally stable or it is globally collapsing to the origin.     

School Choice and the Intergenerational Poverty Trap

This paper formulates a dynamic altruistic model of parental choice of school quality and intergenerational social mobility. It shows that when there are many school qualities, the earnings of children as a function of parental schooling investment is a non‐concave function, which leads to multiple steady‐state equilibria. The paper studies the intergenerational dynamics of parental schooling investment and gives conditions on the rate of return from parental schooling investment under which some families are stuck in an intergenerational poverty trap. The policy implications are also discussed.     

A complete characterization of optimal growth paths in an aggregated model with a non-concave production function

We use the Principle of Optimality in addition to the Euler equation in order to provide a characterization of optimal one-sector growth for all ranges of interest rates when the technology is not convex. Our key result is that the sequence of capital stocks is necessarily monotonic. For certain interest rates we show that the optimal path converges to a steady state only if the initial capital stock is above a critical level, otherwise it converges to zero. Finally, we demonstrate that the set of points for which the value function is differentiable is precisely the set of initial capital stocks from which there is a unique optimal path.