Incomplete markets, labor supply and capital accumulation

Endogenous labor supply decisions are introduced in an equilibrium model of limited insurance against idiosyncratic shocks. Unlike in the standard case with exogenous labor (e.g. [Aiyagari, S.R., 1994. Uninsured idiosyncratic risk and aggregate saving. Quarterly Journal of Economics 109, 659-684; Huggett, M., 1997. The one-sector growth model with idiosyncratic shocks: steady states and dynamics. Journal of Monetary Economics 39, 385-403]), labor supply is likely to be lower than under complete markets. This is due to an ex post wealth effect on labor supply (rich productive agents work fewer hours) that runs counter the precautionary savings motive. As a result, equilibrium savings and output may be lower under incomplete markets. It is also found that long-run savings remain finite even when the interest rate equals the inverse of the discount factor.     

Code and conduct in French cuisine: Impact of code changes on external evaluations

We study the effects of organizational code‐preserving and code‐violating changes on external evaluations by third parties—an essential but under‐studied strategic outcome. We define code‐preserving changes as a variation in the firm's product range that preserves the social code within which the firm positions its offering. By contrast, a code‐violating change corresponds to a variation in the product range that breaks with past codes and embraces another social code. Our analyses of French haute cuisine restaurants show that code‐preserving changes and code‐violating changes have positive effects on external evaluations. Both effects decline with prior evaluations received by the organization, but only the effect of code‐violating changes is reduced with age. Moreover, external evaluations improve when restaurants undertake more code‐preserving changes than their direct competitors but decline when they make more code‐violating changes than competitors. These results enable us to derive implications for research on strategic change, strategic groups, and strategic social positioning. Copyright © 2007 John Wiley & Sons, Ltd.     

Impact of Stressful Situations on Salespersons' Gestures

Interest: This research analyses the influence of situations on salespersons’ gestures and behaviors. This research contributes to this underresearched field by exploring the impact of stressful versus nonstressful situations on salespersons’ personal behavior.

Methods: This research is based on 1,205 gestures observed during 382 sales calls that averaged 11 minutes with 382 salespersons. Half were in stressful situations, and half were in nonstressful situations. This study focuses on pharmaceutical products (drugs) in the medical field, with 95 doctors, 6 judges, 304 average performing salespersons, 39 high performers, and 39 low performers. This study shows how salespersons’ behaviors vary depending on stressful and nonstressful situations. This research also articulates a new field of sales research that is understudied by researchers and suggests new training trends in sales management.

Objective: The objective is to answer questions such as “Does stress influence salespersons’ behavior, and what are the gestures most affected by such situations?” To examine the effects of training on gestures, an experiment with 97 salespersons was conducted during a sales training session. This experiment measured whether salespersons trained on gestures behaved differently than those who were untrained.

Results: In general, stressful or nonstressful situations caused real differences in gestural behavior. In particular, the best salespersons performed the largest number of gestures during stressful situations. For example, stressful situations increased the mechanical or emotional gestures in leg movements or the number of glances.     

Have R&D Spillovers Declined in the 21st Century?

Slow growth over the last decade has prompted policy attention towards increasing R&D spending, often via the tax system. We examine the impact of R&D on firm performance, both by the firm's own investments and through positive (and negative) spillovers from other firms. We analyse panel data on US firms over the last three decades, and allow for time‐varying spillovers in both technology space (knowledge spillover) and product market space (product market rivalry). We show that the magnitude of R&D spillovers remains as large in the second decade of the 21^st century as it was in the mid 1980s. Since the ratio of the social return to the private return to R&D is about four to one, this implies that there remains a strong case for public support of R&D. Positive spillovers appeared to temporarily increase in the 1995–2004 digital technology boom. We also show how these micro estimates relate to estimates from the endogenous growth literature and give some suggestions for future work.     

Migration consequences of welfare reform

We investigate whether recent changes in welfare policy affect the migration of low-educated unmarried mothers. Estimates indicate that welfare reform is associated with an increase in employment-related intrastate migration, and a decrease in non-employment related migration, both within and between states. The net effect was a small increase in intrastate migration and a small decrease in interstate migration. The close link between migration and employment suggests that welfare reform has motivated low-income women to move for economic reasons. In general, welfare policy appears to have a much larger effect on residential location because of its relationship to employment than because of benefit differences between states.