多元化究竟是“馅饼”还是“陷阱”?——基于产出效率视角的实证研究

多元化作为公司发展的一种战略举措,对公司绩效有重要影响。与现有研究不同,基于产出效率视角,以全要素生产率(TFP)作为公司绩效指标,采用平衡面板数据分析来考察具有更强经济动因下的中国上市公司多元化与公司绩效的关系。实证研究发现,上市公司多元化程度与产出效率显著负相关,这意味着盲目多元化对上市公司而言可能是一种"陷阱",从而为"多元化折价"的观点提供了新的诠释。因此,改善管理水平、提高生产效率可能是上市公司提升多元化绩效的重要途径。     

OPTIMAL CAPITAL AND RISK TRANSFERS FOR GROUP DIVERSIFICATION

Diversification is at the core of insurance and other financial business. It constitutes an important issue in the preparation of the new Solvency II framework for the regulation of European insurance undertakings. In this paper, we propose a conceptual framework for a legally enforceable capital and risk transfer which optimally accounts for the designated group diversification benefits. We also provide a consistent valuation principle which is compatible with any prior valuation method. This makes our framework fully flexible and universally applicable. A first simple numerical example illustrates the practicability of our proposal.     

The Impact of Country Diversification on Wealth Effects in Cross-Border Mergers

We posit that country diversification via cross‐border mergers creates wealth by providing benefits for firms that are not available to their shareholders. We hypothesize that these benefits are inversely related to the extent of co‐movement in the economies of the bidder's and target's countries. We examine the wealth effects of U.S. targets and bidders involved in cross‐border mergers with firms in other countries during 1982–1991. We show that wealth effects vary, depending on country affiliations of two merging firms, and are inversely related to the degree of economic co‐movement between the two countries.     

Efficient Option Replication in the Presence of Transactions Costs

In the presence of transaction costs, a risk-return trade-off exists between the quality and the cost of a replicating strategy. In that context, I show how to expand the set of all possible time-based strategies through the introduction of a multi-scale class of strategies, which consist in rebalancing different fractions of an option portfolio at different time frequencies. The method, based on time-scale diversification, is to dynamic replication what investment in diversified portfoliosis to static portfolio selection: in a dynamic context, one may enjoy the benefits of diversification by using different time scales in trading the same asset. This revised version was published online in November 2006 with corrections to the Cover Date.     

Weighted V@R and its Properties

The paper deals with the study of a coherent risk measure, which we call Weighted V@R. It is a risk measure of the form where μ is a probability measure on [0,1] and TV@R stands for Tail V@R. After investigating some basic properties of this risk measure, we apply the obtained results to the financial problems of pricing, optimization, and capital allocation. It turns out that, under some regularity conditions on μ, Weighted V@R possesses some nice properties that are not shared by Tail V@R. To put it briefly, Weighted V@R is “smoother” than Tail V@R. This allows one to say that Weighted V@R is one of the most important classes (or maybe the most important class) of coherent risk measures.     

企业技术多元化战略影响因素的实证研究

作为一类重要的技术创新战略,企业技术多元化近年来得到学术界和实业界的广泛关注。本文从组织学习、创新文化、内外部技术资源配置等方面探讨了企业推进技术多元化战略的主要影响因素,并结合结构方程模型方法进行了实证研究。结果表明,组织学习、创新文化、内部资源保障、外部技术联系对企业开展技术多元化战略均有积极影响,技术多元化战略需要企业遵循开放式创新的思路并加强组织学习。实证结果还表明,外部技术联系对我国企业技术多元化战略的影响程度相对较弱,且大学、科研机构等外部专业技术源的影响程度相对最低,这值得我国企业重视。     

经济学的现代主义贫困——经济学数学化的哲学思考

经济学数学化促进了经济学的发展,同时也让经济学付出了沉重的代价。经济学要使用数学,但要坚持方法的多元化,数学只是其中之一,如此经济学才能向经济学本身回归。     

The performance implications of demand-side diversification: evidence from the US telecommunications sector, 1990–1996

This article contributes to the emerging demand-side perspective in strategy by explaining the demand-side sources of the systematic performance differences (a) between firms that diversify to offer complementary products and those who choose not to diversify, and (b) across and within diversifying firms over time. The US Telecommunications Services sector during 1990–1996 provides a dynamic research setting to test our hypotheses concerning the value-generating effect of shared demand-side strategic assets across the diversifying firms' home- and target-market. We find that the overall quality of demand-side strategic assets of local telephone companies who chose to diversify to offer complementary long-distance services (to their local telephony customers) is higher than those who chose not to diversify. We also find that the variation in market-shares of the diversified local telephone companies in their respective target market(s) for complementary long-distance services is positively influenced by the quality of demand-side strategic assets deployed in the target markets.     

What is beneficial for first-time SME-exporters from a transition economy: A diversified or a focused export-strategy?

We examine whether more focused or more diversified exporting is beneficial for first-time SME-exporters from a small European transition economy (TE). We test the impact of market (geographic) diversification, product diversification and export intensity (export volume) on firm performance. In addition, we test whether a complex export strategy – of simultaneous product- and market-diversification – is beneficial for TE SMEs. We use panel data of all reported, first-time Slovenian exporters in the period 1995–2010. We find that a diversified export strategy in terms of product, market and intensity is positively related to performance although with decreasing returns. Furthermore, a complex diversification strategy pays off for first time TE SME-exporters, but in a decreasing fashion.     

The Performance of Chinese Private Firms in Coping with a Global Financial Crisis: Who Is Best Positioned?

Using organizational flexibility as a research lens, we investigate how private firms, especially SMEs, in China cope with the 2008 financial crisis. Testing data from a large sample of private firms (N=3,459) by difference-indifferences analysis, we find that firms with industrial diversification, geographic expansion and political connections perform better during the crisis than those without. These results are less affected by self-selection problems (as the abrupt crisis provides a natural experiment) and hold up against endogeneity and several other challenges in robustness tests. The findings offer important implications for researchers, business owners, policy makers and future research.