Exogeneity in structural equation models

The practical relevance of several concepts of exogeneity of treatments for the estimation of causal parameters based on observational data are discussed. We show that the traditional concepts, such as strong ignorability and weak and super-exogeneity, are too restrictive if interest lies in average effects (i.e. not on distributional effects of the treatment). We suggest a new definition of exogeneity, KL-exogeneity. It does not rely on distributional assumptions and is not based on counterfactual random variables. As a consequence it can be empirically tested using a proposed test that is simple to implement and is distribution-free.     

A Monte Carlo study on the pitfalls in determining deterministic components in cointegrating models

Recently the use of the so-called ‘Pantula principle’ has been suggested as a means of determining deterministic components in cointegrating models (see Ahking in Journal of Macroeconomics 24, 2002, and Hatemi-J in Economic Modelling 19, 2002). Moreover, the procedure is suggested in the widely used CATS in RATS program (see [Hansen, H., Juselius, K., 1995. CATS in RATS. Estima, United States]). In this paper, we examine, by means of Monte Carlo simulation, the properties of the ‘Pantula principle’. We investigate the five models contained within the Johansen methodology and find that the ‘Pantula principle’ is heavily biased towards choosing the model with an unrestricted constant when the model with a restricted trend is the true one. We suggest a modification that reduces this bias to an important extent.     

Bargaining structure and nominal wage flexibility

In a model with wage setting by monopoly unions and monetary policy conducted by a central bank, the duration of nominal wage contracts is shown to be u-shaped in the degree of centralization, with intermediate bargaining systems yielding contracts of shorter duration and thus, more flexible nominal wages than both decentralized and centralized systems. The theoretical predictions of the model are tested on OECD data, and there is empirical support for the main results on contract length.     

Foreign ownership and investment: do firms locate investments close to the headquarter?

Using an international panel data set of the European pulp and paper industry, we address the issue of a possible home-bias effect for real investments in plants with foreign and domestic locations. We find that there is no effect after controlling for firm effects and plant and firm size. These findings are rubust to a number of different econometric specifications, including a difference-in-difference approach. Our findings appear to be relevant for the debate on the effect of foreign takeovers. As far as we are aware, home-bias effects in real investments within multinational firms have not been studied previously.     

Nutrient Management Use at the Rural–Urban Fringe: Does Demand for Environmental Quality Play a Role?

There are relatively few federal regulations that influence U.S. agricultural production. However, local concerns over environmental quality may influence the management practices on farms. A detailed analysis of corn farms yields insight into this relationship and its implications for the use of cropland best management practices. Our findings suggest that increased contact between working farms and suburban and exurban populations likely increase the use of nutrient management plans, a management-intensive conservation practice. However, nutrient management practices were not found to be associated with waters listed as impaired because of nutrient pollution.     

苹果、蜜蜂与合同:正溢出效应下的科斯-张定理

本文通过经济的“核”分析，以形式化的方式研究了科斯-张定理。特别地，本文说明了在某些条件下，德布鲁-斯卡夫的核收缩定理可应用于有正生产溢出效应的经济中。     

Metamodelling phosphorus best management practices for policy use: a frontier approach

This article presents a modelling system for synthesising heterogeneous productivity and nutrient loading potentials inherent in agricultural cropland for policy use. Phosphorus abatement cost functions for cropland farmers in a southeastern Minnesota watershed are metamodelled using frontier analysis. These functions are used to evaluate policies aimed at reducing nonpoint phosphorus discharges into the Minnesota River. Results indicate an efficiently targeted policy to reduce phosphorus discharge by 40% would cost US$167,700 or 844 per farm.     

Geographic clustering and outward foreign direct investment

This study addresses an important neglected question: To what extent do geographic clusters promote outward foreign direct investment (ODI)? We find evidence that clusters do promote ODI and so support Porter's argument that advantages gained in clusters can be the foundations of successful internationalisation. Digging deeper, we find that certain cluster incumbents promote more ODI than others, with more experienced firms and firms with stronger resource bases accounting for more ODI. We also find that firms located in clusters within major global nodes/cities engage in more ODI. Finally, we find that both localisation and urbanisation economies promote ODI. However, the former, within-industry effects, are more important. Overall, this study echoes Dunning's call for more focus on the ‘L’ component of the ownership, location, internalisation (OLI) paradigm and particularly on the advantages that reside in clusters that make them not only attractive destinations for foreign direct investment (FDI) but also fertile environments from which FDI can spring.     

Taxation, Labor Market Policy and High-Impact Entrepreneurship

Public policy affects the prevalence and performance of both productive and high-impact entrepreneurship. High-impact entrepreneurship prospers when knowledge is successfully generated and exploited in the economy. This process depends on complementary key actors who use their competencies in what we denote a competence bloc. Although variations in economic contexts make prescribing a general panacea impossible, a number of relevant policy areas that affect key actors can be identified. In this paper this is done in the areas of tax policy and labor market policy. It is shown that high and/or distortive taxes and heavy labor market regulations impinge on the creation and functioning of competence blocs, thereby reducing high-impact entrepreneurship.