Wage differentials in the presence of unobserved worker,firm, and match heterogeneity

We consider the problem of estimating and decomposing wage differentials in the presence of unobserved worker, firm, and match heterogeneity. Controlling for these unobservables corrects omitted variable bias in previous studies. It also allows us to measure the contribution of unmeasured characteristics of workers, firms, and worker-firm matches to observed wage differentials. An application to linked employer-employee data shows that decompositions of inter-industry earnings differentials and the male-female differential are misleading when unobserved heterogeneity is ignored.     

The Impact of Academic Research on Business Practice Experiences from Marketing

In the past four decades, academic researchers have developed a variety of concepts they claim are relevant to business practice. This article analyzes the impact of eight of these concepts from a decision-oriented perspective. Four of them – econometric models, diffusion models, causal analysis and mental accounting – have yet to exert a significant influence on business practice. In contrast, concepts like price decisions and structures, conjoint measurement, decision support systems and pricing processes – all developed to solve practical problems – have proven to be highly useful. It seems evident that overly complex methodology, abstract reasoning and the reliance on incidental data substantially hinder the success of concepts in practice. On the other hand, concepts that provide managers with economically valuable insights are well-received in business practice. The impact of practical experience on the definition of research projects has remained limited. This is due less to the reluctance of the parties involved and more to the objective obstacles such as confidentiality and the complexity of problems. Academic researchers are encouraged to more assertively seek out research guidance from business practitioners, and practitioners should more actively provide recommendations needed for relevant research.     

LOOKING AT THE “POPULATION PROBLEM” THROUGH THE PRISM OF HETEROGENEITY: WELFARE AND POLICY ANALYSES*

Upon introducing heterogeneity and dynamics into a model of the demand for children, a problem of optimal population is defined and analyzed. It is shown that from the perspective of social welfare, better‐educated individuals produce too few children while less‐educated individuals produce too many children and all individuals invest too little in the education of their children. The impact of several policy tools geared at addressing the “population problem” is investigated, in particular how child allowances and other tax‐subsidy policies can be harnessed to enhance welfare, and how and why early childhood education programs can mitigate the “population problem.”     

Do members' services packages influence trade union recruitment?

This article details a study of selected new members who joined a white collar professional trade union between 1st January and 30th September, 1988. The study examined the factors which motivated applications to join, especially with reference to a Members' Services Package.     

Knowledge management capabilities in R&D: a UK‐‐Japan company comparison

This paper uses a 'knowledge‐based' approach to compare the management of R&D in two leading chemicals companies, one British (ICI plc) and one Japanese. It describes key differences in the ways they integrate the 'near‐market' knowledge of business units and the scientific knowledge and technical expertise of R&D personnel in central R&D facilities. It shows that the same management practices that underpin superior 'integrative capabilities' in the Japanese firm, including central funding of R&D, job‐rotation and career structures and multidisciplinary project teams, also result in significant R&D weaknesses. The comparison demonstrates that different organisational mechanisms are needed to support (1) the development and (2) the leveraging of specialist knowledge within different innovation contexts . Firms must be able to strike a balance between integrative and specialist capabilities to get the most from their R&D. Moreover, the above characteristics which underpin these capabilities are often 'embedded' in the broader organisation making them difficult to emulate when they represent 'best‐practice' but also making them difficult to change in response to new threats and opportunities.     

The Monday effect revisited: An alternative testing approach

This paper questions traditional approaches for testing the Monday effect of stock returns. We propose an alternative, multiple hypothesis testing approach based on the closure test principle which controls the multiple type I error. We consider the US, the UK and the German stock markets and test Monday related pairwise comparisons of daily expected stock returns, while the probability of committing any type I error is always kept smaller than a prespecified level α, for each combination of true null hypotheses. Overall, the new testing approach supports previous findings of a Monday effect for the 1970s and 1980s, in particular for the US and Germany, while it suggests that the Monday effect has vanished in the 1990s and 2000s in all three markets. The comparison of the closure test procedure, the traditional multiple t-test and the Bonferroni test, a classical multiple test procedure, shows that traditional testing may result in spurious significance while the Bonferroni test may sometimes be too conservative.