Preliminary test estimators of the parameters of simple linear model with measurement error

In this paper, we discuss the properties of preliminary test estimators (PTE) of the parameters of simple linear model with measurement error (ME model) when the slope of the linear model is suspected to be zero. Expressions of the bias, MSE and efficiencies are obtained under conditional as well as unconditional situations with known reliability coefficient. Conditional model results are compared to the standard model without measurement error. We also provide the unconditional model analysis in finite samples. Asymptotic theory under local alternatives is developed when the variance of measurement error or the ratio of the variance of the model error relative to the variance of the measurement error is known. Asymptotic expressions of bias and MSE of the estimators along with their efficiencies are obtained. In every case, it is shown that the measurement error tend to increase the variability of the estimators compared to the estimators without measurement error. Graphs and tables are provided to see these results and to determine optimum level of significance for minimum guaranteed efficiency. Received October 2001 RID="*" ID="*"  A. K. Md. E. Saleh is a Distinguished Research Professor and H. M. Kim is a Ph.D. candidate in the School of Mathematics and Statistics, Carleton University, Ottawa. Acknowledgment. The authors gratefully acknowledge the constructive suggestion of the referees to improve the paper. The research is supported by NSERC grant A3088.     

Where is the opportunity without the customer? An integration of marketing activities, the entrepreneurship process, and institutional theory

Marketing and entrepreneurship have long been recognized as two key responsibilities of the firm. Despite their tight integration in practice, marketing and entrepreneurship as domains of scholarly inquiry have largely progressed within their respective disciplinary boundaries with minimal cross-disciplinary fertilization. Furthermore, although firms increasingly undertake their marketing and entrepreneurial activities across diverse settings, academe has provided little insight into how changes in the institutional environment may substantially alter the processes and outcomes of these undertakings. Herein, we integrate research on marketing activities, the entrepreneurship process, and institutional theory in an effort to address this gap. We first discuss market orientation as enhancing a firm??s opportunity recognition and innovation, whereas marketing mix decisions enhance opportunity exploitation. We then examine how entrepreneurship leads to innovation directed toward market orientation and marketing mix activities. Based on this foundation, we examine differences in marketing and entrepreneurship activities across institutional contexts.     

Competition Policy Convergence: Where Next?

As the 20th Century dawned, there were radical divergences in the policies individual nations pursued toward restraints of competition by cartels and monopolies. Since World War II there has been considerable convergence; many nations have adopted explicit pro-competition policies. This paper traces the reasons for the divergence and then convergence and asks what important steps remain to be taken, especially where the concerns of international trade policy and competition policy intersect. A proposed augmentation of the World Trade Organization's functions to deal with competition policy issues is examined.     

Children's crusade

There's at least $16 billion available to help more children get health care. But on Capitol Hill, there's a bitter dispute over how the money should be spent. Give the states the money, some say, and let them bolster novel health care programs such as Florida's Healthy Kids. Others want to expand Medicaid.     

EQUIVALENCE SCALE SENSITIVITY OF POVERTY STATISTICS FOR THE MEMBER STATES OF THE EUROPEAN COMMUNITY

Using microdata from Household Budget Surveys of the Member States of the European Community, this paper examines the sensitivity of poverty statistics with respect to the choice of the equivalence scale. The results show that the ranking of the countries with respect to the overall poverty incidence is hardly affected when different equivalence scales are used. However, the composition of the poor population shows considerable changes when e.g. subjective equivalence scales are used instead of the OECD equivalence scale. The poverty incidence among specific household groups, such as single elderly and households with children, is particularly sensitive to the choice of the equivalence scale.     

Trade Gains, Paretian Transfer and the Tragedy of the Commons

Consider trade liberalization between two countries, each of which produces two private goods and provides on a voluntary basis one public good (the common). In these circumstances, what are the consequences of trade liberalization on the production of the public good and on welfare in both countries? Using a Ricardian framework, we first show that the opening of trade increases the opportunity cost of producing the public good in both countries and will therefore reduce the aggregate supply of the public good. On the other hand, at the autarky equilibrium, only one country supplies the public good, the other “free rides”. The analysis of the welfare incidence of the opening of trade then reveals that the country which provides the public good under autarky always enjoys a welfare gain from trade while the free rider under autarky does not unless the terms of trade are sufficiently in its favour to compensate for the reduction in the supply of the common. Finally, if all countries involved in trade liberalization can without cost coordinate their supplies of the common, then the implementation of the first-best outcome is shown to be possible with a conditional Paretian transfer scheme.     

How Proper Is Sequential Equilibrium?

A strategy profile of a normal form game is proper if and only if it is quasi-perfect in every extensive form (with that normal form). Thus, properness requires optimality along a sequence of supporting trembles, while sequentiality only requires optimality in the limit. A decision-theoretic implementation of sequential rationality, strategic independence respecting equilibrium (SIRE), is defined and compared to proper equilibrium, using lexicographic probability systems. Finally, we give tremble-based characterizations, which do not involve structural features of the game, of the rankings of strategies that underlie proper equilibrium and SIRE.Journal of Economic LiteratureClassification Numbers: C70, C72.     

I did not call him “Fritz”: Personal recollections of Professor F. A. v. Hayek

Nobel Laureate in Economic Sciences, 1986.