Approximate maximum likelihood estimation for stochastic differential equations with random effects in the drift and the diffusion

Consider N independent stochastic processes \((X_i(t), t\in [0,T])\), \(i=1,\ldots , N\), defined by a stochastic differential equation with random effects where the drift term depends linearly on a random vector \(\Phi _i\) and the diffusion coefficient depends on another linear random effect \(\Psi _i\). For these effects, we consider a joint parametric distribution. We propose and study two approximate likelihoods for estimating the parameters of this joint distribution based on discrete observations of the processes on a fixed time interval. Consistent and \(\sqrt{N}\)-asymptotically Gaussian estimators are obtained when both the number of individuals and the number of observations per individual tend to infinity. The estimation methods are investigated on simulated data and show good performances.     

Basic Income in the Finnish Context

The goal of the Finnish experiment that started this year is to try to get some evidence on how a new social policy instrument mimicking a basic income would work and what kind of behavioural consequences it would have. At this point, there are many strong arguments being made both in favour of and opposed to basic income. Unfortunately, there are not enough facts yet. The Finnish experiment hopes to change that.     

Autonomous Driving — a Challenge for the Automotive Industry

The automotive industry is one of the most important industries in Europe. This industry is responsible for 14% of total production and capital investment in the European manufacturing sector, and in Germany the share amounts to 22%. Structural change within this crucial sector is of relevance for the whole economy. Along with alternative propulsion systems such as electromobility, (semi-)autonomous vehicles are one of the big trends in the automotive industry. For established providers, the possibility of disruptive change poses a threat to existing markets, while a gradual introduction of new technologies also increases competition. Nevertheless, with their strong market position in the premium segment and especially their relevant research activities, European and especially German automotive manufacturers are well placed to successfully master the coming challenges in the automotive market.     

ANFA — National Money Creation as an Existential Threat to the Currency Union?

The recent publication of the previously secret Agreement on Net Financial Assets (ANFA) directed the public’s attention to the possibility that national central banks could create money through purchases of securities on their own account. This paper provides an overview of the legal foundations for ANFA and shows the varying extent to which the member countries use these regulations. What are the interests, risks and consequences for the countries in crisis and the currency union as a whole? Is the ECB properly monitoring ANFA purchases? Could money creation via ANFA act as an explosive device for the currency union?     

Assessing Industrial Buyer Preferences: Using the Swait-Louviere Test to Test the Key Informant Assumption

When using professional buyers to study an organizations buying behavior an important consideration is whether their preferences reflect those of the organization. Since this is a key informant problem, the present article focuses on the issue of the degree to which key informants can be used to provide insights into their own organizations preferences. We conduct a direct test of the key informant assumption using the Swait-Louviere test. In this test preferences from a choice experiment using actual buyers, and from market decisions made by the organization, are estimated separately, then jointly in multinomial logit models. We found that buyers experimental preferences were similar to estimates obtained from the market decisions. Buyers preferences were closer to the intuitive preferences of the organizations top executives than the estimates based on past market decisions, although a model based on the combined data outperformed either. We discuss the implications of these results for industrial buying research.This revised version was published online in May 2005 with a corrected cover date.     

Contracting Under Endogenous Risk

Agents make decisions by trading off cost, return and risk. The literature, however, does not consider the impact of risk on action choice. We show that this tradeoff has important implications for the firm. First, the firm may provide no insurance in the salary. Since the agents action choice will determine her risk, the salary cannot compensate her for it. Second, the firm may not be able to design an incentive scheme to implement particularly risky actions. Finally, the firm may not be able to design a scheme in which the agent splits her effort across multiple tasks. This is particularly problematic for tasks that are technological substitutes.     

Schlechter Wein in alten Schläuchen—Eine Replik auf Helmedag

In der Januarausgabe des WIRTSCHAFTSDIENST ver?ffentlichten wir einen Aufsatz von Professor Fritz Helmedag über die „Abh?ngigkeit der Besch?ftigung von Steuern, Budgetdefiziten und L?hnen“. Hierzu eine Replik von Professor Bernd Lucke und eine Erwiderung von Professor Fritz Helmedag.     

Ethical Orientation and Awareness of Tourism Students

The tourism industry is one of the largest industries in the world, and despite recent events that have made its operating environment more complex, the industry continues to grow [Theobald, 2005, Global Tourism, 3rd edn., Butterworth-Heinemann/Elsevier]. Commensurate to the size of the industry is a growth in the number of students pursuing degree courses in tourism around the world. Despite an increasingly sophisticated literature, the relative recency of the industry and its study has meant little attention has been paid in the ethics literature to the dilemmas facing tourism managers and its students. Based on interviews with senior members of the tourism industry six scenarios are developed with pertinence to the challenges faced by industry practitioners today. This paper then applies the Multidimensional Ethics Scale [Reidenbach and Robin, 1990, Journal of Business Ethics, 9, 639–653] to tourism students at three prominent universities in the U.K., Canada and Australia. In total, 438 responses are achieved. The results have importance for the instruction of tourism students for the future, but also in informing decisions about the tools tourism destinations can effectively employ to control the future direction of the industry     

Are Small Firms Really Less Productive?

Small and medium-sized establishments (SMEs) account for a large proportion of industrial employment and production in almost all countries. Moreover, the recent literature emphasizes the role SMEs play in nurturing entrepreneurship and generating new products and processes. Although SMEs could be a source of new ideas and innovations, there are substantial productivity differences between small and large establishments. In this paper, we analyze three sources of productivity differentials: technical efficiency, returns to scale, and technical change. Our analysis on the creation, survival, and growth of new establishments in Turkish manufacturing industries in the period 1987–1997 shows that all these three factors play a very important role in determining the survival probability and growth prospects of new establishments.     

Change Theory as an Evaluation Tool for a Community Action Board of Directors

The dynamics of a board of directors resemble those of other groups. They are either positive or negative in their flow of communication, their dispute resolution style, their problem solving ability and their ability to make decisions. This article discusses a model of change theory that is used in evaluating the effectiveness of a board of directors and assisting it to make changes for the betterment of the organization it serves.