Econometric Cost Structure Estimates for Cellular Telephony in the United States

This article estimates economies of scale for a sample of five cellular telephony firms in the United States. We reject constant returns to scale for all but the smallest firm studied; the remaining firms exhibit decreasing returns to scale. This finding suggests that scale economies cannot be used to justify the current regulated duopoly structure of United States cellular markets.     

Profit maximization: The ethical mandate of business

The authors propose a model for business ethics which arises directly from business practice. This model is based on a behavioral definition of the economic theory of profit maximization and situates business ethics within opportunity costs. Within that context, they argue that good business and good ethics are synonymous, that ethics is at the heart and center of business, that profits and ethics are intrinsically related.Marist Father Pat Primeaux is a Professor of Theology at Saint John's University, (New York). John Stieber is a Professor of Finance and Economics at Southern Methodist University's Edwin L. Cox School of Business (Dallas). They have collaborated on several articles on the behavioral dimension of economic efficiency. They have also designed and taught courses in business ethics at both the graduate and undergraduate level.     

Mortgage-Backed Futures and Options

This paper empirically tests valuation models for the mortgage-backed futures-options contracts that traded on the Chicago Board of Trade (CBOT) from June of 1989 until March of 1992. A simple contingent-claim model is shown to produce call option values on mortgage-backed futures (MBF) contracts that are unbiased estimates of actual futures-options prices. The ability of the MBF contract to hedge positions in current coupon Government National Mortgage Association (GNMA) securities relative to the effectiveness of cross-hedging GNMA positions with T-note and T-bond futures contracts is also examined.     

Net foreign assets of Dutch commercial banks: A comment

Conclusion The article provides a contribution to the discussion on the net foreign assets of the commerical banks, by drawing renewed attention to the possible passivity of the banking sector, which has gained topicality with the striking developments of 1989. Indeed, the banking sector may be considerably more reactive in regards to net foreign assets formation than has been assumed by various authors and in macroeconometric models on the basis of portfolio optimizing behaviour. However, due to the above-mentioned methodological and empirical shortcomings, Bakkers's study certainly does not provide the final answer to this question.     

THE LOCATION OF NONMETROPOLITAN HIGH-TECH INDUSTRIES: A Comparison of Regional Determinants

A study of the location of three classifications of high-tech industries in rural areas was undertaken using ordinary least squares, Tobit, and a two-step estimation procedure suggested by Heckman (1976). The results indicate that the location decision for high tech firms is influenced primarily by the county population, adjacency to an SMSA, and the expenditures on public infrastructure (exclusive of education expenditures). However, location near interstate highways was generally not a significant factor. Results were similar between branch and unit (single ownership) plants. Some differences in signs of orders of magnitude occurred among the estimation procedures. Making a choice between Tobit and Heckman approaches depends upon the goal of the research.     

专门化、多样化和中国地区工业产业增长的关系

本文通过分析中国29个省（除西藏外）的30个工业产业在1988－1997期间的数据。揭示了工业结构和经济增长之间的关系。本文除研究了传统的生产要素的影响外，重点探讨了产业专门化、专业多样化、竞争度和一省发展的初始水平等因素的作用。结果表明，一个产业外部工业环境的多样性和产业内的竞争度有利于产业的增长，但产业专门影响为负。工业结构对于增长的影响在很大程度上依赖于产业的性质及其地理位置。