腐败影响的宏观经济分析

文章首先将腐败引入Arrow-Kurz-Barro新古典生产函数,在Ramsey-Cass-Koopmans模型框架下,建立宏观经济动态模型,求解最优条件、讨论稳态均衡值的存在性和稳定性,并进行稳态比较的动态分析和短期分析。研究结果表明,贿赂水平的永久增加将减少稳态的资本积累,但对稳态消费的影响则呈现多种可能;短期贿赂水平变动对资本存量与消费水平的影响也呈现出多种可能性。     

反腐败、政治关联与技术创新——基于2010-2015年创业板企业数据的实证分析

本文利用2010—2015年创业板企业数据，研究政治关联对企业技术创新的作用机理，同时实证检验反腐败对政治关联以及企业技术创新的影响机制。研究发现：政治关联对高新技术企业技术创新具有显著的促进作用。对存在政治关联的企业而言，短期内反腐败将会抑制企业技术创新。基于此，本文认为中国政府在继续加大反腐败力度的同时，对反腐败冲击较为严重但具有创新意愿的高新技术企业而言，需要建立相应的支持政策，从而规避对该类企业造成的短期经济波动风险。     

Structural Adjustment Programme, Deforestation and Biodiversity Loss in Ghana

An empirical investigation is undertaken into the impact of the Structural Adjustment Programme (SAP) on forest and biodiversity loss in Ghana between the period 1965–1995. In the first part of the analysis, a four-equation recursive model, consisting of forest loss, cocoa land, maize land and timber production equations, is employed to examine the impact of the SAP on forest loss. The first equation is a function of the last three, and the last three are functions of mainly prices. Piecewise linear and switching regression approaches are used to distinguish between the influence of the post from the pre-adjustment impacts. These results together with a specie-forest area relationship are used to investigate the impact of the SAP on biodiversity loss. The overall results indicate that cocoa land expansion and timber production, but not maize land expansion, are the significant causes of forest loss in Ghana. However, the impact on forest loss in the post-adjustment period was reduced. The rate of biodiversity loss also reduced in the post-adjustment period. Changes in relative output and input prices due to the SAP may have played a significant role in the reduced impact of agricultural and timber related deforestation and biodiversity loss in the post-adjustment period.     

Remittances and deforestation in developing countries: Is institutional quality paramount?

This study examines the impact of remittance inflows on deforestation in developing countries. We also investigate the role of institutional quality in enhancing remittances’ effect in reducing deforestation. Our results suggest that overall remittances reduce deforestation. We show that remittances’ reduction effect on deforestation is greater in middle-income countries than in low-income countries. Considering institutional quality, our findings suggest that, for the entire sample, and in low- and middle-income countries, control of corruption, political stability, government effectiveness and rule of law act to reduce deforestation. Moreover, institutional quality enhances the impact of remittances on reducing deforestation in the entire sample and in middle-income countries. In contrast, in low-income countries, institutional quality does not complement remittances to reduce deforestation.These results imply that, to reduce deforestation rates, the focus should not only be on economic development, but to an even greater extent, on institutional quality.     

Converting Forests to Farms: The Economic Benefits of Clearing Forests in Agricultural Settlements in the Amazon

Agricultural expansion into tropical forests is believed to bring local economic benefits at the expense of global environmental costs. The resulting tension is reflected in Brazilian government policy. The national agrarian reform program has settled farm families in the Amazon region since the 1970s, with the expectation that they will clear forests in order to farm the land. On the other hand, recent Brazilian policy initiatives seek to reduce deforestation to mitigate climate change. We contribute to the policy debate that surrounds these dual goals for the Amazon by estimating the marginal effects of new agricultural land on the full income and assets of farm settlers over a 13-year period from 1996 to 2009. Using micro panel data from agrarian settlements where forest was being rapidly cleared, and controlling for factors that would otherwise confound the relationship, we estimate the effect of converting forest to agriculture on total household income to estimate the opportunity cost of conserving forest. Our measure of income reflects any re-allocation of resources by utility maximizing households and any productivity effects due to loss of forest ecosystem services. The estimated effect of new agricultural land on income is positive, but small relative to the income per hectare of previously cleared land. However, we show that income increases investment in physical assets, which raises households’ income generating capacity and future accumulation of assets. Thus, while there is only a small immediate income gain from clearing more forest, the long-term effects on wealth are still substantial. This demonstrates that given the right conditions, conversion of forest to agricultural land can be an impetus for asset accumulation by smallholders. It also highlights the importance of considering the indirect and long-term welfare benefits of new agricultural land when assessing the opportunity costs of forest conservation.     

人工智能的财富分配效应研究*

人工智能对经济不平等的影响引起学术界的广泛重视，但是现有研究以分析其对劳动收入不平等的影响为主，关于人工智能对财富分配从而对财产性收入不平等影响的相关研究尚有欠缺。本文通过构建一个连续时间异质性个体动态一般均衡模型，将人工智能对生产技术的影响看作一揽子偏向性技术进步，研究人工智能技术对财富分配的影响。分析发现，人工智能对财富不平等的影响在短期和长期表现有所不同，短期中人工智能技术的应用会提高经济中财富分配不平等程度，而长期中其财富分配效应则取决于人工智能对不同类型技术进步的促进程度。核心机制在于，人工智能技术进步的多样性在短期和长期中对资本回报率产生不同影响，短期中各类技术进步总是会提高资本回报率，而在长期，不同类型的技术进步对资本回报率的影响出现差异。基于以上结论，本文就我国如何在应用人工智能促进增长的同时预防不平等程度扩大提出了政策建议。     

The stork, the plow, rural social structure and tropical deforestation in poor countries?

This study is an exploration of the relationships between income, demographic pressure, technological change in agriculture, and the structure of political economies in light of cross-country differences in deforestation. The study focuses on small farmers and shifting cultivation. The analysis is based on a model developed by Larson (1994) that accounts for rural poverty, rootlessness, and distribution of landholdings. Regression equations model the average annual rate of deforestation, the relative area under forests, and a recursive model that includes both the deforestation rate and the forested area. Deforestation was reasonably well explained by a dummy variable for Asia, a rank order variable of the amount of forested area in 1980, the gross domestic product per capita in 1990, the average annual population growth rate during 1981-90, and the percentage increase in value added to agriculture during 1981-90 in 1990 dollars. Findings indicate that a 10% increase in the population growth rate increased the rate of deforestation by 10.6%. A 10% increase in income per capita increased deforestation by 49.5%. The influence of income on deforestation followed Kuznet's U-shaped curve. The turning point for reduced deforestation was income of $3500 per capita. Only Central and South America are near this income level. An increase in 1 agricultural worker per household increased deforestation by 50%. A 10% increase in smallholders' share of agricultural land reduced deforestation by 3.4%. Countries with high rural rootlessness had 23.6% less relative area under forests, suggesting that rural rootlessness rather than poverty per se leads to deforestation. The recursive model shows that demographic pressures led to deforestation and were mediated by technological change. Political economy theories of deforestation received strong empirical support.     

GLOBAL POPULATION GROWTH,TECHNOLOGY, AND MALTHUSIAN CONSTRAINTS: A QUANTITATIVE GROWTH THEORETIC PERSPECTIVE

We structurally estimate a two‐sector Schumpeterian growth model with endogenous population and finite land reserves to study the long‐run evolution of global population, technological progress, and the demand for food. The estimated model closely replicates trajectories for world population, GDP, sectoral productivity growth, and crop land area from 1960 to 2010. Projections from 2010 onward show a slowdown of technological progress, and, because it is a key determinant of fertility costs, significant population growth. By 2100, global population reaches 12.4 billion and agricultural production doubles, but the land constraint does not bind because of capital investment and technological progress.     

Income inequality and FDI: evidence with Turkish data

This article explores how foreign direct investment (FDI) and other determinants impact income inequality in Turkey in the short- and long-run. We apply the nonlinear auto-regressive distributed lag (ARDL) modelling approach, which is suitable for small samples. The data for the study cover the years from 1970 to 2008. The empirical results indicate the existence of a co-integration relationship among the variables with asymmetric adjustment of the income distribution in the short- and long-run. The negative impact of FDI on the Gini coefficient, decreasing income inequality, is statistically significant in the short- and long-run, though with a quantitatively small impact in both cases. In the short run, GDP growth increases inequality initially, an effect that is reversed in the next period, increases in domestic gross capital formation decreases inequality, and increases in the literacy rate have very minor adverse effects on income equality. However, in the long run these variables have no statistically significant effects on the Gini coefficient. A reduction in the population growth rate reduces inequality in the short run but has no effect in the long run, whereas an increase in the rate reduces inequality in the long run but has no effect in the short run.     

Land conversion pace under uncertainty and irreversibility: too fast or too slow?

In this paper stochastic dynamic programming is used to investigate land conversion decisions taken by a multitude of landholders under uncertainty about the value of environmental services and irreversible development. We study land conversion under competition on the market for agricultural products when voluntary and mandatory measures are combined by the Government to induce habitat conservation. We show that land conversion can be delayed by paying landholders for the provision of environmental services and by limiting the individual extent of developable land. It is found, instead, that the presence of ceilings on aggregate conversion may lead to runs which rapidly exhaust the targeted amount of land. We study the impact of uncertainty on the optimal conversion policy and discuss conversion dynamics under different policy scenarios on the basis of the relative long-run expected rate of deforestation. Interestingly, we show that uncertainty, even if it induces conversion postponement in the short-run, increases the average rate of deforestation and reduces expected time for total conversion in the long run. Finally, we illustrate our findings through some numerical simulations.     

Wage Inequality,Increased Competition,and Trade Liberalization: Short Run vs Long Run

This paper examines the impact of increased competition and trade liberalization on skilled–unskilled wage inequality in the short run as well as the long run. It is shown that an increase in the number of firms in the producer services sector increases wage inequality in the short run even if the income shares of capital in the industrial and agricultural sectors were identical. A decrease in the services sector's fixed cost decreases wage inequality in the short run if the income share of capital in the agricultural sector is relatively large. Owing to the presence of external economies, a decrease in the services sector's fixed cost increases wage inequality in the long run. A decrease in import duty on the agricultural good increases wage inequality in the short as well as the long run but its effect in the long run is stronger due to the presence of external economies in the industrial sector.     

The technological determinants of long‐run inequality

I explore the effect of skill‐biased technological change and unbiased technological progress on long‐run inequality using a theoretical model in which the supply of skilled and unskilled workers is endogenous. The main assumption of the model is that young agents can finance their education and become skilled workers by borrowing against their future income on an imperfect credit market. I show that whenever the rate of unbiased technological progress is sufficiently high there is no steady‐state inequality, independent of the degree of skill bias. If instead the rate of unbiased technological progress is low, then the long‐run skill premium increases with the technological skill bias. Therefore, similarly to the short run, in the long run higher technological skill bias may cause higher inequality. However, contrary to the short run, in the long run unbiased technological progress is more important than technological skill bias in determining inequality. I also discuss how the efficiency of the educational technology and the degree of financial development affect long‐run inequality.     

土地价格市场化对中国工业部门要素投入与技术选择的影响

土地价格市场化是中国要素价格改革的重要组成部分。文章基于2007-2013年中国工业部门面板数据,实证检验了工业用地相对价格变动对中国工业部门要素投入调整和技术进步偏向的影响。研究发现：短期内,东部地区工业用地相对价格上升抑制了工业用地需求,并诱致了非土地要素对工业用地的替代,但在全国层面和中西部地区并没有显著观察到土地要素相对价格变动的短期诱致替代效应;长期内,工业用地价格上升诱致了能源与物质资本节约型和知识资本使用型技术的使用,土地节约型技术进步特征仅在东部地区得到了显著支持,在全国层面和中西部地区都不显著,这与中国政府主导型的工业用地价格市场化改革特征密切相关。未来中国应以土地价格市场化改革为契机,重视土地价格杠杆对工业部门要素结构优化和技术创新的激励效应,推动工业转型升级。     

房价与地价关系的因果检验:1998-2006

文章在考虑通货膨胀的条件下,利用我国1998-2006年的房价和地价的季度数据建立误差纠正模型(ECM),使用Granger因果检验方法对我国的房价和地价的关系进行实证检验,得出结论:短期而言,房价对地价没有影响,而地价是房价的Granger原因;长期来说,房价和地价存在双向因果关系.因此,要控制房价,短期内关键是抑制地价过快上涨;长期则要通过合理安排土地供给,加强住宅的建设规划引导,从而避免房地产价格的大起大落.     

Ethanol Production, Food and Forests

This paper investigates the direct and indirect impacts of ethanol production on land use, deforestation and food production. A partial equilibrium model of a national economy with two sectors and two regions, one of which includes a forest, is developed. It analyses how an exogenous increase in the ethanol price affects input allocation (land and labor) between sectors (energy crop and food). The total effect of ethanol prices on food production and deforestation is decomposed into three partial effects. First, the well-documented effect of direct land competition between rival uses arises; it increases deforestation and decreases food production. Second, an indirect displacement of food production across regions, possibly provoked by the reaction of international food prices, increases deforestation and reduces the food sector’s output. Finally, labor mobility between sectors and regions tends to decrease food production but also deforestation. The total impact of ethanol production on food production is negative while there is an ambiguous impact on deforestation.     

Trade liberalization,firm entry,and income inequality

This paper examines the short‐ and long‐run effects of trade liberalization via tariff reductions on income inequality in an economy, which is characterized by an imperfectly competitive urban manufacturing sector and a perfectly competitive rural agricultural sector. Tariff reductions reduce domestic output in the importable urban manufacturing sector, leading to shifts of capital from the urban sector to the rural agricultural sector. This can narrow the wage gap between skilled and unskilled labor in the short run. However, the lowered capital cost attracts new firms, and subsequently excessive entry of firms, to the urban manufacturing sector. This firm entry effect can mitigate the favorable effect of tariff reductions on wage inequality in the long run. Empirical study confirms the findings.     

政治关联、并购战略选择与企业价值*

本文以2010年发生并购的上市公司为初始样本,实证检验了企业政治关联对并购当年（2010年）和并购后连续五年（2011—2015年）企业价值的影响,并进一步分析这种影响在并购企业采用不同并购战略选择时是否存在显著差异。本文研究发现,并购企业中央政治关联和地方政治关联均对并购后企业短期价值和长期价值具有显著的正向影响。进一步研究发现,从总体上看,在一定条件下,跨地并购战略在企业中央政治关联与企业价值（短期/长期）间有正向的部分中介效应,即中央政治关联企业通过跨地并购战略的实施进一步增强了对企业价值的提升作用;企业地方政治关联可以显著地促进多元化并购战略的实施,而实施多元化并购战略进一步增强了对企业价值（短期/长期）的抑制作用,即多元化并购战略在企业地方政治关联对企业价值的影响机制中发挥部分中介效应,并且对直接正效应具有抑制作用。     

Taxation, Bequests, and Short and Long Run Timber Supplies: An Overlapping Generations Problem

This paper uses an overlapping generations model with one-sided altruism to study the effects of several forest taxes that target bequests and affect timber supply. Unlike previous work, we investigate bequests and timber supply in both the short and long run when bequests are costly (e.g., taxed). The landowner's problem is examined in the short run, while the government's problem is examined in the long run assuming the existence of a steady state. We also consider taxes targeting harvests, growth, savings and bequests. Several new results are established concerning the interactions of taxes that might be used by a government to alter short and long run forest capital stocks: (i) the presence of a forest bequest tax affects the neutrality of harvest tax in both the short and long run, (ii) in the long run the bequest tax decreases bequests and timber supplies. When the bequest tax is not present, the capital income tax is neutral with respect to bequest and timber supply, while the harvest tax is neutral only if forest productivity is also not taxed. Finally, (iii) in the short run, the substitution and total effects of taxes in landowner decisions generally depend on the presence of the bequest tax. The results have implications for Pigouvian tax design and second best tax choice.     

Cattle ranching and deforestation in the Brazilian Pantanal

Regional economic indicators and incentives for agricultural landowners in the Brazilian Pantanal were explored in order to understand better the observed increases in deforestation for the implantation of cultivated pastures to assist in the extensive management of beef cattle. About 95% of Pantanal lands are privately owned and about 80% are used as extensively managed cattle ranches. The mean size of agricultural property in the Pantanal is increasing, the cattle density and numbers are decreasing, the proportion of land in cultivated pastures is decreasing, but the area is increasing, land and animal wealth is highly concentrated, and the amount and proportion of land in natural pastures is decreasing. Statistical analyses reveal that land and animal wealth, intensification of agricultural effort, human population, natural pastures and location relative to infrastructure and regional markets influence either the magnitude or the proportion of Pantanal lands deforested for the purpose of implanting cultivated pastures or both. A nonlinear link between wealth measures and deforestation was not established. Improving the profitability of forestland should unambiguously improve the likelihood of its continued management as forest and the maintenance of biological diversity. Potential sustainable uses of forested lands and native biological diversity in the Pantanal include the sustainable extraction of forest species, ranching of wild and feral species, and tourism.     

A dynamic macroeconomic model with monopolistic behavior in the labor market

Is the monopolistic behavior of a wage setting labor union compatible, in the long and in the short run, with price stability and full employment? What is the effect, if any, of economic policies? The answers are strongly affected by the prevailing technology and by the union's objective function. With limited short run production possibilities, a short run trade-off may exist between full employment and maximum expected real wage revenues. In the long run, however, when expectations are fully adjusted, this trade-off disappears. Therefore, a labor union consistently pursuing maximum short run expected real wage revenues may not maximize long run effective real wage revenues. Price stability is granted in the long run, provided inflation is not induced by public policy. The only instrument a pure consuming government has to fight long unemployment is to reduce its share of aggregate demand.