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Does the Diversification–Firm Performance Relationship Change Over Time? A Meta‐Analytical Review

We study the relationship between diversification and firm performance in the context of the decline in levels of diversification over time. We argue that the pressure to reduce diversification may have more strongly affected those firms whose diversification strategies were most detrimental to firm performance. We employ meta‐analytical regression (MARA) in order to test our hypotheses, using a total of 267 primary studies containing 387 effect sizes based on 150,000 firm‐level observations from over 60 years of research on the diversification–firm performance relationship. The findings suggest that levels of unrelated diversification have decreased, whereas levels of related diversification have increased since the mid‐1990s, following an initial decrease in the 1970s and 1980s. Furthermore, we find that the relationship between unrelated diversification and firm performance has improved significantly over time, whereas the relationship between related diversification and performance has remained relatively stable.     

Organizational structure characteristics’ influences on international purchasing performance in different purchasing locations

This study contributes to the understanding of how firms should structure their purchasing organization to improve their performance. While the research into structural characteristics’ impacts on purchasing performance is evolving, it is still incomplete, especially concerning the contingencies on different purchasing environments. Drawing on ideas from the organizational information processing and contingency approaches as well as the international business literature, the present study proposes a model in which three key organizational structure characteristics – centralization, standardization, and specialization – are associated with purchasing performance. This study posits that the relationships are contingent on a purchasing location’s formal and informal institutional context. Based on a sample of 195 German manufacturers, the model is empirically tested using structural equation modeling. The findings support the relevance of organizational structure characteristics for international purchasing and firm performance and they also support the notion that the effects are contingent on the purchasing location’s institutional context.     

The optimal taxation of risky capital income: An elasticity rule

Should risky capital income be taxed like safe income or should tax rates be differentiated? The question is analyzed in a 2-assets model of portfolio choice. Flat tax rates are chosen in order to maximize the investor's expected utility from terminal wealth subject to an expected tax revenue constraint. If lump-sum taxes are not available, optimal tax rates are characterized by an elasticity rule: The relative change in the risk remuneration should be equal to the inverse of the product of two elasticities. One is the output elasticity of capital. The other is the demand elasticity for risky investments with respect to a revenue preserving tax variation.