Diminishing Returns and the Limit of Athletic Performance

The purpose of this paper is to estimate athletic performance profiles over time, to establish that diminishing returns is a characteristic of performance functions, to measure the rate of the marginal decline, and to measure the upper (lower) bound or limit of performance. The empirical results yield estimates of the limiting value of athletic performance and the frontier maximum (minimum) record. Since lower bounds in the running events have been shown to be sensitive to choice of the nonlinear model, logistic and an exponential model for the men's running and distance events are estimated as a cross-check on my differential equation model. The issue of the gender gap (whether women will ever catch men) in athletic performance is also explored.     

Food Aid, Food Prices, and Producer Disincentives in Ethiopia

Although the short-term aims of food aid are well conceived, strong concerns have been voiced regarding the long-term impacts of such aid on incentives for agricultural producers in recipient countries. This article examines the statistical link between food aid shipments and food prices in Ethiopia over the period 1996–2006. Monthly data from three markets and three commodities are used to estimate a system of seemingly unrelated regression models for food prices. Results indicate that previous year food aid shipments reduce prices in all producer and consumer markets. These effects, however, appear to be limited to the set of internationally traded commodities that are domestically marketed. A recursive regression procedure is used to identify the food aid threshold at which a negative aid effect emerges. Food aid shipments that constitute less than 10% of domestic production appear to be benign, but shipments above this level show signs of being disruptive to local markets. We use a simple policy simulation to argue that production-sensitive targeting, e.g., conditioning food aid on local food production, would help to circumvent disincentive effects.     

与娜塔莉·德约博格对话

有一部电视卡通《弗莱格》(Fraggle Rock)就吓坏了我。杰拉德·马特:你在瑞典出生,获得过马尔摩艺术学院美术新媒体学位,是吗?娜塔莉·德约博格:是的。     

Local public goods and private suppliers: Musical suburbs replayed

This paper deals with the existence of private market suppliers in a standard local public goods model. The result of this modification can be a cycling process instigated by rich households rather than poor households. The theoretical model provides empirical implications for capitalization studies and policy implications for the provision and financing of local public goods including education.     

What mbo really is: Results require a complete program

Management by objectives (MBO) is commonly described too narrowly; firms that report unsuccessful experiences have been practicing a limited program. To clear up the confusion that beclouds MBO, the authors first describe the concept and its emphasis on results (the achievement of objectives) and on human behavior and motivation (fulfillment of needs and participation). The MBO system is then examined. The system has four basic components: setting objectives, developing action plans, conducting periodic reviews, and appraising annual performance. Many firms have found that MBO plays the leading role in the managerial process of achieving corporate objectives. The authors list seven major benefits that an organization can expect.     

Arthur McIvor and Ronald Johnston. Miners' Lung: A History of Dust Disease in British Coal Mining

Over the course of the past two decades, historians have begunto pay serious and sustained attention to the history of occupationalhealth, much of it analyzing the role of social, economic, andpolitical factors in the medical recognition of industrial disease.Although much has been published about the British coal industry,this is the first book to address the issue of health and safetyin this critically important sector of the British economy.Miners’ Lung, building on the work done by Jo