Evidence on agglomeration economies,diseconomies, and growth

Conventional urban economic analysis suggests that a local economy's size is closely related to a number of features, including levels of human capital and the availability of specialized inputs, which are likely to influence positively the rate at which it accumulates further economic activity. At the same time, urban theory also suggests that once cities reach a certain level of size, these agglomeration benefits begin to peter out, while diseconomies rise rapidly. Consequently, we should see an ‘inverted U‐shaped’ pattern of growth with respect to economic size—rates of growth first rise, then fall as size increases. This paper shows that, while such a pattern is largely absent from recent data on growth in metropolitan area population and employment, it emerges strikingly in county‐level data. Copyright © 2002 John Wiley & Sons, Ltd.     

The teaching of ethics in management accounting: progress and prospects

Recent research has shown that, although still on a limited scale, the teaching of business ethics in UK higher education has been increasing in recent years. This paper reports on a postal questionnaire survey conducted to investigate the extent to which ethical issues are covered in the teaching of management accounting in higher education. The principal findings are that the majority of management accounting lecturers in the British Isles do not incorporate ethics. About a third of the respondents to the survey do address ethical issues, although about half of those say they do so only implicitly. Various factors underlying the findings and prospects for the future are discussed.     

The Impact of Cannabis Use on Health

Summary Chronic daily cannabis use has been shown to have long term harmful health effects, which in turn is expected to reduce labour market productivity. The evidence is less clear on the health impact of less frequent consumption, which is the more typical mode of use, and previous empirical studies fail to find robust evidence of an adverse impact of these modes of use on labour market productivity. This paper attempts to shed some light on this issue by directly estimating the impact of cannabis consumption in the past week and past year on health status using information on prime age individuals living in Australia. We find that cannabis use does reduce self-assessed health status, with the effect of weekly use being of a similar magnitude as smoking cigarettes daily. Moreover, we find evidence of a dose-response relationship in the health impact of cannabis use, with annual use having roughly half the impact of weekly use.Helpful comments on an earlier draft were received from Jan van Ours, Rosalie Pacula, two anonymous referees and participants at the 81st Annual Conference of the Western Economic Association International.     

Regression using mixed annual and quarterly data

By consideration of either Generalised Least-Squares of Theil-Goldberger estimates of equations for which data on the dependent variable is available for a subset of the sample period on only an annual basis, it is shown that best estimates of the equation coefficients may be obtained by Ordinary Least-Squares estimation over the complete set of quarterly observations with quarterly averages substituted for the missing quarterly data, and symmetrically for the corresponding observations on the regressor variables. The approach is extended to the Two-Stage Least-Squares case, and to the (structurally or stochastically) autoregressive case.     

Labour Market Structure and Inequality: A Comparison of Italy and the U.S.

Markets with rigid labour regulations and centralized wage setting are often thought to be inefficient but egalitarian. Using a model of off-and on-the-job search and event-history, individual-level data for Italy and the U.S., we show that while the cross-sectional wage distributions of young Italian males are much more compressed than are the comparable distributions for young white U.S. males, the estimated search model implies that the distribution of lifetime welfare is no more disperse in the U.S. than it is in Italy. Our model implies that the high frequency of movements between labour market states leads to both a relatively equitable distribution of "long run" welfare in the U.S. and a high level of cross-sectional inequality.     

New Product Development For Service Companies

It is well known that services differ from manufactured goods in a number of significant ways. Services are largely intangible, produced and consumed simultaneously, heterogeneous and perishable. These differences can lead to changes in service management. Christopher J. Easingwood has investigated how new products development practices in service organizations may reflect these differences. He has profiled practices found in a sample of service companies in the United Kingdom on topics ranging from idea generation to post-launch assessment, together with the strategic role and organizational location of new products. A number of special characteristics of the new product activity in services companies are identified. For instance, the number of new product introductions may be restricted due to customer and staff confusion when faced with a proliferation of service products. Test markets are used primarily to ensure the proper functioning of the service rather than to provide a base for a national sales projection. These and other characteristics appear to be appropriate adaptations to the special features of services. They are part of a pattern that shows some of the ways that service companies have adapted the new product development process to meet unique problems in the service environment.     

Medical Malpractice Liability and Physician Migration

This paper uses national data on individual physicians and two control groups to provide evidence on the extent to which each of five medical malpractice reforms impacts the decision to move one's medical practice to another state. We find robust evidence that states that have implemented noneconomic damage caps experience less out-migration of physicians than states that do not have these reforms. In addition, we find some evidence that joint and several liability reforms and patient compensation funds also impact the migration decisions of physicians.     

黑天鹅未现，油市勿慌

市场正在评估两种对立的尾部风险：日本灾后需求下降,以及利比亚禁飞区和沙特阿拉伯军队进入巴林,这让各地的油市交易人员晕头转向。不过在未知事件发生前,供应相对充足的石油料将打压布伦特原油价格,最终跌至100美元下方。