Problems and lessons from irrigation projects in less developed countries of Africa

This paper reviews important constraints to the development of small‐holder irrigation schemes in less developed areas of Africa. It is based on two case studies from Southern Africa and experience elsewhere on the continent. Lessons from past experience and the institutional and human development considerations required for successful projects are discussed.     

The probability of a “gross” violation of an efficient markets variance inequality

This note considers the small sample bias of the empirical variances of observed and ex-post-rational prices of financial assets, and shows that this can be much more severe than has previously been thought.     

Advance Notice and Job Search: More on the Value of an Early Start

This paper investigates the effects of advance notice of impending job loss on the length of jobless spells of displaced workers. We evaluate the performance of a formal search model and offer a generalization of the model that provides an alternative but related approach to the most recent empirically based literature. Evidence of gains from early search are found for all broad gender-occupation groups except blue-collar males.     

Employment adjustment in two countries with poor reputations: Analysis of aggregate, firm, and flow data for Portugal and Germany

This paper supplements aggregate time-series analysis of the speed of employment adjustment with evidence from firm panel and flow data for two countries – Portugal and Germany – sharing unenviable labor market reputations. The Portuguese labor market is often portrayed as terminally inert, while that of Germany as badly ailing. We report broad consistency in the results across data sets in favor of Portugal. In benchmarking Portugal against Germany, the adverse reputation of the former – if not necessarily that of the latter country – may have been exaggerated in contemporary policy debate.We thank, without implicating, two anonymous reviewers of this journal for their helpful remarks on an earlier version of the paper.     

Sunk Costs and the Entry Decision

This paper considers the role of sunk costs in the decision to enter a market. Its goal is to provide a policy-relevant approach to the question: when are sunk costs so great as to serve as a barrier to entry? To do this, the model presented nests both a model of pure hit-and-run entry and a simple “lottery-ticket” model of long-term entry in which the entrant knows that entry may or may not ultimately prove successful. It illustrates clearly the strategic differences between sunk and nonsunk fixed costs. The paper also considers the incumbent’s problem of choosing between entry deterrence and accommodation. Finally, out of this model comes a measure of the height of the sunk cost barrier to entry that may be useful for competition policy purposes.     

Towards Authenticity: A Sartrean Perspective on Business Ethics

Taking a Sartrean existentialist viewpoint towards business ethics, in particular, concerning the question of the nature of businesspersons’ moral character, provides for a dramatically distinct set of reflections from those afforded by the received view on character, namely that of Aristotelian-based virtue ethics. Insofar as Sartre’s philosophy places human freedom at center stage, I argue that the authenticity with which a businessperson approaches moral situations depends on the degree of consciousness he or she has of the various choices at stake. Finally, I consider some practical changes in business ethics education, managerial decision-making, and business organizations that Sartrean reflections might prompt.     

The institutional drivers of sustainable landscapes: a case study of the ‘Mayan Zone’ in Quintana Roo, Mexico

Research on the dynamics of tropical forest land use and cover change (LUCC) has focused on the three scenarios: (1) deforestation/degradation; (2) settled, degraded areas in recovery, and (3) sparsely settled, expansive, intact forest. Through examination of a central Quintana Roo, Mexico case study we propose a fourth scenario of a ‘sustainable landscape’: an inhabited, productively used, forested landscape that nonetheless shows little change or net gains in forest cover over the last 25 years. We use Landsat images to demonstrate a low incidence of net deforestation, 0.01% for the 1984–2000 period, the lowest recorded deforestation rate for southeastern Mexico. Institutional innovations such as an agrarian reform process that established large common property forests for non-timber forest product extraction, and later innovations such as sustainable forest management institutions have driven the outcome of low net deforestation, added to multiple organizational processes that promote sustainable land use.     

Modeling time series information into option prices: An empirical evaluation of statistical projection and GARCH option pricing model

This paper compares the empirical performances of statistical projection models with those of the Black–Scholes (adapted to account for skew) and the GARCH option pricing models. Empirical analysis on S&P500 index options shows that the out-of-sample pricing and projected trading performances of the semi-parametric and nonparametric projection models are substantially better than more traditional models. Results further indicate that econometric models based on nonlinear projections of observable inputs perform better than models based on OLS projections, consistent with the notion that the true unobservable option pricing model is inherently a nonlinear function of its inputs. The econometric option models presented in this paper should prove useful and complement mainstream mathematical modeling methods in both research and practice.     

让援助更为明智

为全世界儿童提供初等学校教育将是一项漫长而且耗费甚大的工程。幸好，自1990年以来，主要的捐助者极大地增加了他们对于总体教育，特别是初等教育的官方发展援助（ODA）。2003年对所有教育目标的捐赠承诺额达到了67亿美元，是6年前承诺额真实数量的两倍以上。对于初等教育的承诺额增加得甚至更快，在1990—2003年间增长了四倍，达到19亿美元。对于初等教育的援助比总体ODA增长的更快，其在承诺额中的份额从1990年的0．4％增长到2003年的1．9％（见图1和图2）。     

Major issues in Indonesia's urban land development

This article addresses issues of urban land development in Indonesia, including urban land use; ownership and transfers; land taxation; and land information systems. Until very recently, urban land-use planning in Indonesia was largely top-down in character and neglected to include the public as a stakeholder. This article argues that the role of government in urban land-use development needs to change at all levels and that the capacity of local government in land-use management needs to be strengthened. The presence of private developers in urban development should be encouraged. Land development permits—as a means of urban development control—while they may still be necessary should be granted primarily in relation to urban land-use plans (RUTR). Land taxation instruments have not been effectively applied to control land utilisation in the cities. Data and information on land affairs are lacking.