This study introduces a new scheme of data envelopment analysis (DEA) named cost gradient measure (CGM) to evaluate technical efficiency. In this model, we can obtain more cost conscious technical efficiency than those by other traditional DEA models such as CCR[7] and slacks-based measure (SBM)...

In choosing a glide path strategy for asset allocation over their working lives, retirement savers face a tradeoff between the higher expected wealth provided by strategies that maintain or increase equity holdings over time, against the greater potential security offered from shifting into more...

Obtaining appropriate forecasts for the future population is a vital component of public policy analysis for issues ranging from government budgets to pension systems. Traditionally, demographic forecasters rely on a deterministic approach with various scenarios informed by expert opinion. This...

A line of recent studies cast doubt on the efficacy of the lifecycle investment strategy, which calls for switching into a more conservative investment portfolio as retirement approaches, as a suitable way to provide for the retirement needs of workers with defined-contribution pensions. After...

Firstly, we discuss differences between Farrell and Pareto-Koopmans efficiency measures in DEA, and propose a composite method for discriminating them. Then, we extend the method to so-called “epsilon based-measure (EBM).” The EBM can examine the robustness and stability of efficiency...

A line of recent studies cast doubt on the efficacy of the lifecycle investment strategy, which calls for switching into a more conservative investment portfolio as retirement approaches, as a suitable way to provide for the retirement needs of workers with defined-contribution pensions. After...

2006 年10 月24 日，携帯電話の番号ポータビリティ（MNP）制度が導入された．MNP 制度は消費者が携帯電話会社を変更する際に生じるコスト，つまりスイッチング・コス...

The first impetus to Zimbabwe’s drive to hyperinflation and official dollarization predates the disruption in production caused by the fast-track land reform programme. The initial push came from the departure from relatively disciplined fiscal policies to a string of measures aimed at...

There is a very large literature that examines the relationship between health and income. Two main hypotheses have been investigated: the relative income hypothesis and the absolute income hypothesis. Most of previous studies that used mortality data have been criticized for estimating an...

In many repeated interactions, repetition is not guaranteed but instead must be agreed upon. We formulate a model of voluntary repetition by introducing outside options to a repeated Prisoner’s Dilemma and investigate how the structure of outside options affects the sustainability of mutual...