‘Second-generation’ MVs and the evolution of the Green Revolution: the case of Central Luzon, 1966–90

By now new modern rice varieties (MVs) with multiple pest and disease resistance have completely replaced early MVs, such as IR5 and IR8, except in a few areas of Asia. This study attempts to identify the changing impacts of ‘first-generation’ and ‘second-generation’ MVs on productivity in rice farming by estimating the yield function, while correcting selectivity bias arising from the choice of varieties. For this purpose, we used farm-level survey data collected for eleven cropping seasons in Central Luzon in the Philippines from 1966 to 1990. We found that while the yield advantage of first-generation MVs over traditional varieties was limited, the yield-increasing effect of second-generation MVs over first-generation MVs was highly significant. In particular, the adoption of improved MVs significantly contributed to yield growth under the irrigated condition and during the dry season. Thus, we conclude that the Green Revolution would not have been revolutionary without the development and the diffusion of second-generation MVs with multiple pest and disease resistance.     

Price Cap Regulation in the Cable Television Industry: Why was the Demand Stagnant?

During the period of 1992 to 1996, the cable television industry in the United States was regulated by the FCC, which took several price cap measures. As a result, the increase in the price cable service substantially slowed. However, the cable demand did not rise as anticipated. Using a model of imperfectly discriminating monopoly, the paper empirically investigates this curious phenomenon of stagnant demand despite lower prices. The paper finds that the FCC's price capping constrained both demand and prices. The demand was constrained since the price cap was designed to cover almost all TV channels carried by cable systems, and subsequently discouraged cable systems from meeting different customer preferences with multi-tier services.     

北京市下岗职工的再就业分析

该文利用独自收集到的有关北京市下岗职工的样本数据,分析了影响下岗职工失业持续时间的原因,探讨了影响下岗职工再就业前后收入变化的原因.通过分析得出以下主要结论:第一,下岗政策虽然在一定程度上促进了劳动力市场的形成,但随着下岗职工失业持续时间的延长,下岗政策已成为阻碍劳动力市场化的因素,同时也妨碍了市场经济体制下社会失业保障体制的建立和完善.第二,为了使更多的有在传统体制下工作经历的下岗职工,尤其是大量从事过企业管理工作的下岗职工尽快地实现再就业,不仅需要对他们进行各种技能的培训,而且更需要对他们进行如何适应新的经济环境的再教育.第三,"下岗"不仅是中国经济体制转型过程中的一个特殊时期的政策,实际上也是结构性失业在中国特有经济体制中表现出来的一种特有的现象.对于这种由于产业结构变化带来的失业问题,政府有必要制定更多的积极性的失业政策.     

The impact of knowledge diversity: Integrating two economic perspectives through the dynamic capability approach

This paper analyzes the two economic perspectives underlying the contradictory results of existing studies regarding the relationship between diversity and performance and integrates them using the dynamic capability approach. Transaction cost economics suggests that knowledge diversity has a negative impact on cost-saving performance, whereas evolutionary economics suggests that knowledge diversity has a positive impact on value-creation performance. According to the dynamic capability approach, the perspective of transaction cost economics is shown to relate to ordinary capabilities, whereas the perspective of evolutionary economics is shown to relate to dynamic capabilities. The former should be pursued in subservience to the latter.     

Changing Sources of Household Income,Poverty, and Sectoral Inequality in Sri Lanka, 1990–2006

Comparing dynamic changes in household income and poverty among urban, rural, and estate sectors in Sri Lanka from 1990 to 2006, this study finds that a shift of household income away from farm to nonfarm sources is accompanied by a significant improvement in household income and reduction in poverty, particularly in the rural sector. Major contributing factors are the rise in returns to labor, in general, and educated labor, in particular, due to the development of the nonfarm labor market. Persistently low income among estate households can be explained primarily by the limited availability of nonfarm employment opportunities and the low education levels of working members.     

The effects of economic conditions and tax structures on state tax revenue flow

Tax portfolio literature has focused on deriving the optimal composition of the tax structure for a particular state. However, tax revenue flow is influenced by both tax structure and economic conditions which are unique for each state. Therefore, the literature has been unable to generalize the characteristics of optimal tax structures. This paper examines the contribution of a state's economic condition, as well as the tax structure, to the growth and variability of tax revenue flow. In addition, the optimal tax portfolio is studied for changes in revenue growth targets and economic conditions.     

User benefits and operator costs of mobile number portability in Japan and impact on market competitiveness

This paper aims to review the process of mobile phone operators agreeing to introduce mobile number portability (MNP) in Japan. A study group formed by the Ministry of Internal Affairs and Communications estimated the proportion of MNP users and analyzed the user benefits and associated costs to introduce MNP. Owing to the particular market structure and technology available, MNP was expected to yield a larger benefit in the Japanese mobile market than that seen in other countries. Based on the results of the research reviewed with respect to the market situation one year after introducing MNP, the increased competition in the mobile phone market was onfirmed by decreasing call charges and a reduction in the share of the dominant operator.     

Two Types of Disagreement in Group Discussions of Japanese Undergraduates

In this study we investigated the nature of disagreement, which is a necessary component of a good discussion. We obtained 27 group discussion scenes by Japanese undergraduates that were evaluated by two ways: impression rating and ranking. As a result of factor analysis for the impression rating data, five factors were extracted: activeness, multidirection and unification of discussion, relationships of participants, development and sophistication of discussion, and sincerity of the participants, and each factor scores of each scene was simultaneously calculated. Each scene’s rank score was also calculated by relative comparisons. A significant positive correlation was found between the mean factor and the rank scores except for Factor 3 (relationships of participants). To consider the reason for the difference relating to Factor 3’s score, we scrutinized the discussion process of four scenes of the different patterns of the factor and rank scores. From the analysis of conversations, we suggested that this difference reflected ways of disagreement. By introducing a probative discourse tags for discussion (pDTD), we reasoned that the frequency of disagreement made Factor 3’s score negative and the absence of the second part of adjacency pairs made the rank score worse. The explicit speech and actions of blame such as emotional and aggressive expression, and neglect of treatment for the minor opinion made also the discussion unfair, but we think that these behaviors might erupt from the ground made by the accumulated implicit behaviors such as the absence of the second part. We finally concluded that the criticism type of disagreement increased the rank scores, and its censure type produced lower results, and the proper ways of disagreement in group discussions were discussed.