How to estimate market concentration given grouped data

A novel method is proposed of estimating market concentration for the census case in which firms are grouped into size classes and all that is known about the firms in each category is their number and aggregate size. The formula arises as a way of applying an alternative expression for the concentration ratio based upon the original and first moment size distributions of firms. The semi-parametric technique, which includes a method of interval as well as point estimation, is derived, applied and validated using actual and simulated data. It is anticipated that the estimator will be of use in competition analysis as well as in academic research.     

Why do some firms contract out production? Evidence from firm-level panel data

This paper examines the determinants of self-employment and transitions from salaried employment to self-employment using two sets of Finnish data from the 1990s. The results show that capital constraints have only a minor effect on new business starts. Human capital, in the form of intergenerational links in self-employment and psychological factors play a much larger role. The paper also provides empirical evidence that less risk-averse workers are more likely to become entrepreneurs.     

饲草生产学教学方法的探讨

《饲草生产学》是草业科学专业重要的选修课程。在饲草生产学教学过程中,通过构建新的课程教学体系,加强课程条件建设,改进课程教学方法和教学手段,注重实践教学环节和学生能力的培养,调动学生学习的积极性,提高了教学质量。     

快速城镇化对山东省粮食生产的挑战

随着经济的快速发展,中国城镇化水平不断提高。在快速城镇化发展过程中,大量耕地资源被城市建设占用,大批农村劳动力进入城市,农业水资源紧张态势日趋严峻,农业产业结构调整使粮食作物种植面积不断减少,这些都对粮食生产和粮食安全产生了不利影响。因此,要协调好城镇化发展和粮食生产的关系,合理规划城镇用地,以保障粮食生产及安全。     

中国钢铁行业能源内部的替代弹性分析

本文运用中国钢铁行业滞后一期的产出代替劳动和资本变量,把钢铁行业能源投入要素分解为煤炭、石油、天然气和电力的投入,建立了一个超越对数生产函数模型,用岭回归估算了中国钢铁行业各能源品种投入要素的产出弹性、替代弹性。结果表明:煤炭与石油、煤炭与天然气、煤炭与电力的替代弹性在1左右,中国钢铁行业可通过用石油、天然气、电力替代煤炭来实现其行业全要素能源效率的提高。     

The ECFA and its expected effect on cross-strait trade and investment: a Taiwanese perspective

To come to terms with the realization of ASEAN+1, Taiwan had concluded with mainland China a special free trade agreement (FTA), the Economic Cooperation Framework Agreement (ECFA) in June 2010. This framework agreement provides an early harvest agreement of near-term tariff elimination, including detailed product schedules for goods and services from each side, with the final shape of fuller trade liberalization in goods and services taking years to negotiate and realize. The conclusion of the ECFA has been considered as a major breakthrough in cross-strait talks and economic relationships, even though it is by no means free from controversies inside Taiwan. The authors are therefore motivated by hot debates in Taiwan to reflect on the expected trade effect of the ECFA by taking into account the factor of cross-strait global production networks. In particular, we examine with a proposed model and statistical robustness, the trend of Taiwan-based firms' localization in mainland China, driven in part by constant movements in global production networks, which generates complicated and dynamic relationships between Taiwan's investment-induced trade and structural shift in Taiwan's exports to mainland China. Based on our empirical findings, we reflect on the conventional views on the trade effect of the free trade agreement. The results of our analyses tend to support a cautious view about the trade effect of the ECFA. Without denying the significance of the ECFA and deepening cross-strait economic relationships, we argue that the impact of the ECFA should be interpreted in a wider context than just the trade perspective, as the conventional wisdom and the existing evaluations suggested.     

Gains From Trade for Nonmaterialists,Environmentalists, and the Overworked

The author proposes an alternative to the traditional definition of the gains from international trade and, hence, an alternative defense of free trade. Rather than showing that free trade allows a country to consume more of all final goods, the author's approach shows that free trade allows a country to consume the same basket of final goods that it would consume in autarchy but at a reduced cost measured in terms of foregone productive resources. Thus, free trade gives a country the option to maintain the same material standard of living that it would have enjoyed in autarchy while enjoying more leisure and using fewer natural resources in production.     

Structural production layer decomposition: a new method to measure differences between MRIO databases for footprint assessments

Recent empirical assessments revealed that footprint indicators calculated with various multi-regional input–output (MRIO) databases deliver deviating results. In this paper, we propose a new method, called structural production layer decomposition (SPLD), which complements existing structural decomposition approaches. SPLD enables differentiating between effects stemming from specific parts in the technology matrix, e.g. trade blocks vs. domestic blocks, while still allowing to link the various effects to the total region footprint. Using the carbon footprint of the EU-28 in 2011 as an example, we analyse the differences between EXIOBASE, Eora, GTAP and WIOD. Identical environmental data are used across all MRIO databases. In all model comparisons, variations in domestic blocks have a more significant impact on the carbon footprint than variations in trade blocks. The results provide a wealth of information for MRIO developers and are relevant for policy makers designing climate policy measures targeted to specific stages along product supply chains.     

为了指标而竞争*——来自中国煤矿企业的证据#br#

中国矿难治理取得了不可忽视的成就,但总结其成功经验的研究尚显不足。本文认为安全生产的总量指标控制是一种降低中国煤矿企业矿难死亡人数的有效方式。笔者手工搜集了2002—2006年中国煤矿企业矿难死亡人数和省级安全生产控制考核数据,并与工业企业数据库进行匹配,发现单个煤矿事故死亡人数和同地区其他煤矿事故死亡人数之间显著负相关,说明企业间存在指标竞争现象。广义双重差分回归结果显示,在控制指标越少的省份,企业间指标竞争越激烈。异质性分析发现,在超标省份或者主管官员晋升的关键时期,指标竞争更加激烈。最后,单个煤矿企业死亡人数与异省邻市矿难死亡人数不相关,排除了矿难导致监管加强的“威慑效应”。本文的研究结果表明,煤矿安全生产总量指标控制对企业安全生产有显著作用。     

生产分工视角的中国对美国货物出口竞争力验证

考虑生产分工对中美间经贸联系程度、贸易规模和结构的影响,基于生产分工下价值链视角,构建出口竞争力测度指标体系,验证中国对美国货物出口竞争力。结果显示:2016年及之前,中国仅在杂项制品大类上,对美国显示出较强出口竞争力,机械和运输设备、动物和植物油、油脂和蜡我国具有比较优势,化学成品及有关产品、按原料分类的制成品双方竞争性较强,其余大类上,中国对美国出口竞争力不具优势。引入其他国家作对比的分析结果表明:中国对对比国家均无显著出口竞争力,而且对美国出口具有单价优势的资本技术密集型产品,对这些国家出口多缺乏单价优势,而2017年以来对美国和对比国家的贸易变化,进一步勾画出中国对美国货物出口竞争力不足。在生产分工主导全球产业发展背景下,提升我国在全球生产分工中的参与地位,宜强化自主技术研发、提升外资质量和技术外溢、加快"走出去"学习先进技术。