Illegal Migration, Border Enforcement, and Growth

This paper analyzes the economic consequences of illegal migrants in the context of a model of trade and growth. In the model, capital and domestic labor are mobile sectors while illegal migrants are sector-specific. These assumptions give rise to a production possibility curve (with migrants) that lies partially inside the zero migration production possibility frontier. It is this feature of the model which generates ambiguous results regarding the relation betweendomestic welfare, illegal migrants, and enforcement. The steady-state growth path with migrants may lie above or below the balanced growth path without migrants.     

Effort, trade, and unemployment

Abstract.  This paper incorporates equilibrium unemployment caused by efficiency wages into a monopolistic competition model of trade. Worker effort is treated as an endogenous variable that depends on the optimizing behaviour of firms and workers. Opening up trade induces firms to demand greater worker effort and to cut the size of their workforce. This counteracts the positive employment effect due to entry of firms. Circumstances are indicated in which the two effects just balance, leaving aggregate employment unchanged. Trade unambiguously increases worker effort, thereby enhancing within-firm productivity.     

Effort,efficiency, and incentives in economic organizations

This paper establishes the possibility of achieving both efficiency and incentive compatibility within a hierarchical organization, even when managers are effortaverse, as long as efficiency is defined as incorporating managers' effort disutilities as opportunity costs of production. It is further argued that this approach yields the same (i.e., Pareto) type of efficiency as achieved by the perfectly competitive price system when managerial disutility of effort is allowed. Thus, the negative results published by Miller and Murrell hold because of the non-Paretian objective functions assumed for central planners.     

适度消费与环境保护

本文从经济活动的消费入手,揭示过度消费对环境造成的巨大危害并分析其原因,进而提出适度消费的观点和实行适度消费的两点建议。     

适中论

当代的主调是和平与发展；在这个当代，本文尝试从人文、社科、科技三个方面共十个命题，论述一个观点，“为了适，必须中”：（１）人文思考——哲理，历史；（２）社科评价——政治运动，宣传导向，经济体制，收获递减律；（３）科技分析——数学的极值，系统工程的优化技术，材料物理的能量学与动力学分析，功能（性能、才能）过剩     

Going Through Hell: Increased Work Effort in the Aftermath of Terrorism in Norway*

I analyze how sickness‐absence behavior in Norwegian municipalities was affected by exposure to the terrorist attack in Norway in 2011. The main finding is that in municipalities from which a resident was killed in the attack, sickness absence declined by 4 percent compared with municipalities without victims. The effect is precise, stable, and persistent. The results do not seem to be driven by changing labor market composition. The effect is found also in neighboring municipalities and is larger for people close to the age of the victims.     

Illegal aliens,unemployment and immigration policy

"This paper develops a simple two-country model of illegal immigration in an attempt to examine the interaction among variables such as the stock of migrant labor, the unemployment rates of the two economies, and the rate of spending by the host country on the enforcement of its immigration restrictions. The focus of the analysis is on the dynamics of immigration policy and on its role in determining the nature of the mechanism by which disturbances to the labor market of one country are transmitted to that of the other in the short run and in the long run."     

Incentive Pay, Worker Effort, and Trade Protection

Positive and normative aspects of trade policy are examined when firms offer incentive pay to workers, such as piece-rate pay and profit sharing, to deal with worker moral hazard. Protection increases the incentive pay rate. Its effect on effort depends upon the degree of labor mobility and the type of the incentive pay. In the presence of a piece-rate pay, protection induces second-order welfare losses. But in the presence of profit sharing, there is a direct impact of protection on the incentive-compatibility constraint facing firms and hence there is a first-order positive effect on welfare.     

Noisy information, interest rate shocks and the Great Moderation

In this paper we evaluate the hypothesis that the Great Moderation is partly the result of a less activist monetary policy. We simulate a New Keynesian model in which the central bank can only observe a noisy estimate of the output gap and find that the less pronounced reaction of the Federal Reserve to output gap fluctuations since 1979 can account for a substantial part of the reduction in the standard deviation of GDP associated with the Great Moderation. Our simulations are consistent with the empirically documented smaller magnitude and impact of interest rate shocks since the early 1980s.     

Conflict, Effort and Capital Stock in UK Wage Determination

The paper is concerned with the determination of wages, unemployment and labour productivity in the UK. The theoretical model suggests that in addition to economic factors, historical and ideological elements play an important role in the determination of wages, unemployment and productivity. Particular emphasis is put on the capital shortage hypothesis. It is argued that capital scrapping in response to the two oil price shocks, combined with subsequent sluggish growth in capital, may be responsible for the rise of the NAIRU and the persistence of unemployment. The empirical analysis is concerned with testing the theoretical model, using quarterly data for the UK from 1966 until 1994. We use cointegration analysis for the determination of wages, unemployment and labour productivity. This revised version was published online in July 2006 with corrections to the Cover Date.     

Enjoying Catch and Fishing Effort: The Effort Effect in Recreational Fisheries

Recreational fishermen derive utility from catch and fishing effort. Building our analysis on the Gordon-Clark model for renewable resources, we show that a lower importance of catch may result in higher catches. While this effect also holds under first-best management, it may destabilize open-access recreational fisheries to the point of stock collapse. Technical progress in recreational fisheries may mask such dynamics as it enables unaltered angler behavior and constant catches during stock declines.     

Human Capital, Study Effort, and Persistent Income Inequality

The paper shows that if an individual's cost of human capital accumulation depends on his parents' human capital and there exists a "raw labor" sector of production, individuals with low parental human capital may devote little effort in study and become unskilled workers. Further, if an individual exerts little effort in study, the human capital he accumulated may be even less than his parents'. Consequently, his children will have even lower parental human capital than him and they will therefore also become unskilled. Thus, the model shows that even when education is free, income inequality can persist across generations.     

所有权结构、自私性努力与投资阻塞问题

许多学者基于代理人和代理人之间的关系分析了国有企业的"内耗"和地方政府的"内拼",但他们分析的只是次级"内耗"和次级"内拼",是给定所有权安排下的"内耗"和"内拼",他们没有注意到委托人和代理人之间的初级"内耗"和初级"内拼"。本文从投资阻塞的视角分析了国有企业的初级"内耗"和地方政府的初级"内拼"。我们的分析表明,通过议价力量配置来解决国有企业的初级"内耗"问题是可以奏效的,但是通过议价力量配置来解决地方政府的初级"内拼"问题却是很难奏效的,必须在"立宪"层次上界定好中央政府和地方政府的控制权边界,否则就会带来不断重复的试错性成本(比如宏观调控成本)。     

制药企业广告投资、研发投入与创新药绩效

在药品市场竞争日益激烈的背景下,如何协调广告战略与研发战略之间的关系,提高创新药市场绩效成为制药企业面对的重要问题.本文构建双寡头制药企业的研发-价格竞争博弈模型,探究制药企业的广告战略、研发战略和政府价格管制政策对于不同类型企业研发激励、药品定价、市场份额、创新利润和创新药市场绩效的综合影响机制.研究发现,当且仅当广告投资和研发投入之间存在"挤入"效应时,实施广告战略才可能为企业带来竞争优势,但广告投资过大将导致企业利润的损失;其次,当且仅当广告投资效率较高时,实施广告战略才能增进创新药市场绩效;最后,价格管制政策和广告战略对企业利润产生综合影响,在一定条件下,价格管制能够强化广告战略对实施企业利润的增进效果,广告战略则有助于改善价格管制对实施企业市场份额的不利影响.     

Effort and performance in group contests

We study contest performance by focusing on the per capita payoffs of the contestants in an important class of asymmetric two-group contests. The group with the higher valuation has a greater chance of winning the contest whenever the rent-seeking technology is increasing and concave. We note that equilibrium efforts and payoffs per capita are uniquely defined and can be subjected to a comparative statics analysis. We show that payoff per capita for a group increases with its own valuation but decreases with the valuation of the opposing group. Per capita payoff for a group increases with its population.     

Migration, unemployment and discrimination

This paper uses a dynamic efficiency-wage model to analyze the consequences of immigration for a small country when there is discrimination against immigrants in a dual labor market with unemployment. Discrimination is of the type ‘equal pay for equal work, but unequal work’ which is characteristic of economies with ‘guest-worker’ systems. The model exhibits three regimes for rising immigration levels. Immigration is most beneficial for natives in the intermediate regime. An analysis of regime switches shows that changes attributable to ‘globalization’ and technical progress are consistent with growing opposition to immigration.     

地方政府保障房供给的合作性努力与自私性努力：一项实证研究

地方政府具体落实保障房供给政策,其行为取向是保障房有效供给的决定性因素。构建改进的多任务委托代理模型,研究激励约束机制与地方政府付出的努力,以及与保障房供给行为取向之间的关系。研究结果表明：其一,地方政府的合作性努力水平与激励强度正相关。其二,约束机制缺失时,地方政府的自私性努力水平不随外部性强度的变化而变化;存在有效约束机制时,自私性努力水平与惩罚强度负相关。因而,增加保障房有效供给,既要激励地方政府的合作性努力,也要约束地方政府的自私性努力。     

Migration,growth, distribution and welfare

In this note we argue that the inverted U curve of inequality is a technical derivative of the attributes of the conventional indices of inequality; that these indices are inadequate measures of the change in welfare associated with the typical distributional consequences of rural-to-urban migration; and that an explicit welfare judgment with respect to this process should and can be made.     

Migration,Unemployment, and Skill Downgrading

In this paper, we analyze the labor market impacts of immigration under flexible and rigid labor market regimes. A general equilibrium framework is developed, accounting for skill heterogeneity and labor market frictions, where unemployed medium‐skilled manufacturing workers are downgraded into low‐skilled service jobs, while low‐skilled service workers might end up unemployed. The analytical analysis shows that medium‐skill immigration decreases low‐skilled unemployment under the flexible regime, indicating a complementarity effect, while the rigid regime induces a substitution effect, leading to low‐skilled unemployment. Moreover, it leads to wage polarization. In a numerical analysis, the economic effects of different migration scenarios are quantified.     

企业集群内部的企业家协调

企业集群内具有相同的、相近的或相关的社会文化背景、共同的价值观念的企业家集聚,对于集群内的知识和技术扩散非常重要,有利于集群内的企业之间、企业与其他机构之间的密切合作,从而为集群内部的企业家协调创造了条件.企业集群内企业家协调的重要性,即非正式的私人之间,通过社会网络的接触有时比正式的研发合作更为重要.