ness of an element is the ratio of in-degrees over in-degrees plus out-degrees of the element, and ranges from 0 to l (Pieters et al. 1995). Elements with high abstractness scores are

In the wake of controversy over allegations of espionage by Wen Ho Lee, a nuclear scientist at the Department of Energy’s Los Alamos National Laboratory, the department ordered that polygraph tests be given to scientists working in similar positions. Soon thereafter, at the request of Congress, the department asked the National Research Council (NRC) to conduct a thorough study of polygraph tes...

This paper addresses the case of complementary services with vertical relations. Using the example of airport handling activities, we develop a model to investigate the effects on welfare and competitiveness of four different handling market situations. We find out that the usual Cournot result on welfare when firms compete in complementary goods is verified unless there are efficiency gaps bet...

I characterize a finite additive utility representation for preferences over menus. The numbers of both positive and negative components in this representation are expressed explicitly in terms of preference. These expressions can be used to characterize models of temptation, perfectionism, context effects, and other phenomena. © 2008 Elsevier Inc. All rights reserved. JEL classification: D81

We introduce a model of a local public goods economy with a continuum of agents and jurisdictions with finite, but unbounded populations. Under boundedness of per capita payoffs we demonstrate nonemptiness of the core of the economy. We then demonstrate that ∗We are indebted to Manfredo Dix, Vladislav Gorlov, Mamoru Kaneko, Hideo Konishi, Tom Nechyba, Roy Radner, and Bill Weiss for helpful comm...

Counterfeiting causes hundreds of billions dollars of losses around the world every year. Due to the growing prominence of online commerce, the seriousness of the situation could soon become much worse. Hence, reaching a clear understanding of the fundamental economic incentives behind this practice is of vital importance. In this paper, we investigate a problem within which a firm selling a co...

Simple additive weighting is a well-known method for scoring and ranking alternative options based on multiple attributes. However the pitfalls associated with this approach are not widely appreciated. For example, the apparently innocuous step of normalizing the various attribute data in order to obtain comparable figures leads to markedly different rankings depending on which normalization is...

Videogames now enable players to spend virtual fortunes on exotic virtual goods and even create and sell virtual artefacts. Online consumers may also browse endlessly through virtual marketplaces and create and display virtual goods. These virtual commodities are desired and enjoyed as if they were real, but are not actually bought, or owned in a material sense – often resulting in frustration ...

This exchange represents a follow-up to an article on the effects of state high school exit examinations that previously appeared in this journal (Warren, Grodsky, & Kalogrides 2009). That 2009 was article featured prominently in a report by the National Research Council (NRC) that evaluated the efficacy of test-based accountability systems. Hanushek (2012) was highly critical of the NRC’s inte...