Interior point methods, a decade after Karmarkar—a survey, with application to the smallest eigenvalue problem

The introduction of Karmarkar's polynomial algorithm for linear programming (LP) in 1984 has influenced wide areas in the field of optimization. While in the 1980s emphasis was on developing and implementing efficient variants of interior point methods for LP, the 1990s have shown applicability to certain structured nonlinear programming and combinatorial problems. We will give a historical account of the developments and illustrate the typical results by analyzing a new method for computing the smallest eigenvalue of a matrix. We formulate this latter problem as a so-called semidefinite optimization problem. Semidefinite optimization has recently gained much attention since it has a lot of applications in various fields (like control and system theory, combinatorial optimization, algebra, statistics, structural design) and semidefinite problems can be efficiently solved with interior point methods.     

Canadian Health Reform: A Gender Analysis

We analyze the gender impact of the current Canadian system of first-dollar health insurance by examining the use of physicians' services and acute-care hospital services in the Canadian province of Manitoba from April 1, 1997, to March 31, 1999. First, we describe the use by age and sex of healthcare resources offered with universal access at no cost to individuals. Second, we argue that women have a particular interest in maintaining single-payer insurance, because women are moderately high users of healthcare resources, while men tend to be low or catastrophic users who would be shielded from the full force of market-oriented reforms. Third, we attempt to refocus the debate about the gender implications of market-oriented health reform by noting that medicare transfers resources to women of reproductive age from the rest of society, a form of social wage paid as in-kind compensation to women for nonpaid reproductive labor.     

Balance-of-payments policy. Instruments and criteria

Summary In this article the author makes clear that in principle targets of economic policy can serve as criteria for balance of payments policy. The instruments of balance of payments policy are discussed in the light of their practical implications. Exchange rate policy is treated as a means of incomes policy. The author argues that only equilibrium of the balance of payments can be considered as a long term criterium for balance of payments policy in the case of stable exchange rates. In the case of flexible exchange rates the criterium can be found in the degree of domestic economic stability.     

The New Keynesian Phillips curve with myopic agents

Empirical estimations of the New Keynesian Phillips curve support hybrid versions with a positive weight on lagged inflation and a weight less than one on expected inflation. We argue that myopic price setting of some agents explains the low weight on expected inflation. The lagged term can be explained by trend extrapolation if information about the future is costly. In a laboratory experiment we implement the Calvo (1983) microfoundations of the Phillips curve. Our hypotheses are supported by the experimental data. About half of the subjects set optimal Calvo prices while about a third is myopic.     

Regional price levels in Germany

Cross-sectional evidence on price levels is scarce for all countries. However, several studies suggest that there might exist considerable differences in price levels within countries, which has obvious welfare implications. A sample of price levels in 50 German cities in 1993 is used to analyse the determinants of inter-city price level differentials. The most important explanatory variables for price level differentials are population size and density and the average wage level. Using this information, the price levels are predicted in all 440 German districts and aggregated to the state level. At the state level convergence of the price levels to a common mean is found, but at a very low speed. The estimated half-life is about 19 years.     

Strategic management of intangible assets and value drivers in R&D organizations

This paper takes a resource-based view of the R&D process. Based on the literature, we forward a theory that allows us to predict the dynamic interaction and transformation of five key resources, namely human, relational, organizational, monetary, and physical. Utilizing visualization tools allows us to test this theory on various levels in order to draw insights from the data. The output of the analysis improves the strategic understanding of an organization. In particular, it improves the understanding of how intangible resources drive the value creation in an R&D organization. Further analysis of the data allows us to identify resources that are either under utilized or over utilized, which might indicate inefficiencies in the organizational performance.     

Decision making under risk in Deal or No Deal

We analyse the choices of 399 contestants in the Australian version of the television game show Deal or No Deal. We calculate risk aversion bounds for each contestant, revealing considerable heterogeneity. We then estimate a structural stochastic choice model that captures the dynamic decision problem faced by contestants. To address individual heterogeneity, we nest the dynamic problem within the settings of both a random effects and a random coefficients probit model. Our structural model produces plausible estimates of risk aversion, confirms the role of individual heterogeneity and suggests that a model of stochastic choice is indeed appropriate. We find mixed evidence of greater risk aversion by females. We also examine generalizations to expected utility theory, finding that the rank‐dependent utility model adds non‐negligible explanatory power and indicates optimism in probability weighting. Finally, we test, but are unable to confirm, the existence of an endowment effect for lotteries. Copyright © 2009 John Wiley & Sons, Ltd.