企业文化:从管理学走进经济学

对真实世界的关注使得管理学能够发现并形成企业文化理论,企业文化的发展显示了传统激励理论的不足和精神激励的重要性。为了将企业文化这一重要的变量加以解释,经济学中出现了多种不同的研究进路,这不仅拓展了经济学研究的领域,也深化了管理学的直觉与描述。     

我国上市公司股权集中度与公司绩效的理论与实证研究

本文以净资产收益率、主营业务资产收益率及市净率为被解释变量,股权集中度为被解释变量,并使用公司总资产的自然对数代表公司规模、财务杠杆、净利润增长率作为控制变量,从公司治理角度分析股权结构对公司绩效的影响。从农林牧渔业、采掘业、制造业等11个行业中挑选了923家上市公司为样本,分别对样本总体和各行业的数据进行了回归分析。此研究的政策意义在于现阶段上市公司治理结构的改革不应盲目模仿英美模式无视中国的国情,过于强调股权分散。认为只有保持股权的适度集中才有助于我国上市公司的长远发展和整体绩效的提高。     

公司治理对上市公司估值的影响分析

本文在分析公司治理机制的基础上,将影响公司治理的各个因素进行量化,通过构建上市公司估值模型,对公司治理影响估值进行实证分析.本文的结论是,公司治理对上市公司估值的影响很大;治理结构完善的公司,其估值水平相对较高,反之亦反之.     

中美上市公司年度报告披露准则比较研究

本文旨在比较分析中美上市公司年度报告披露准则，为我国修订年报准则提出建议。本文首先比较分析了中美年报准则要求披露的项目内容及其特点，在此基础上，结合我／国年报披露中存在的问题，建议在修订年报准则时借鉴美国制订年报准则的经验，并提出了几点具体改进措施。     

Hedging Housing Risk*

An unusually rich source of data on housing prices in Stockholm is used to analyze the investment implications of housing choices. This empirical analysis derives market-wide price and return series for housing investment during a 13-year period, and it also provides estimates of the individual-specific, idiosyncratic, variation in housing returns. Because the idiosyncratic component follows an autocorrelated process, the analysis of portfolio choice is dependent upon the holding period. We analyze the composition of household investment portfolios containing housing, common stocks, stocks in real estate holding companies, bonds, and t-bills. For short holding periods, the efficient portfolio contains essentially no housing. For longer periods, low-risk portfolios contain 15 to 50 percent housing. These results suggest that there are large potential gains from policies or institutions that would permit households to hedge their lumpy investments in housing. We estimate the potential value of hedges in reducing risk to households, yet yielding the same investment returns. The value is surprisingly large, especially to poorer homeowners.     

Why Capital Income Taxes Survive in Open Economies: The Role of Multinational Firms

This paper discusses the role of multinational firms and double taxation treaties for corporate income taxation in open economies. We show that it is optimal for a small open economy to levy positive corporate income taxes if multinational firms are taxed according to the full taxation after deduction system or the foreign tax credit system. Positive corporate taxes also occur in the asymmetric case where some countries apply the exemption system and others apply the tax credit system. If all countries apply the exemption system, the optimal corporate income tax is zero. We also show that, under tax competition, corporate income taxes are not necessarily too low from the perspective of the economy as a whole. While the undertaxation result is confirmed for the case of the exemption system, tax rates may also be inefficiently high if the deduction or the credit systems are applied.     

Diversification, Ownership and Control of Swedish Corporations

We study the short‐ and long‐term valuation effects of Swedish takeovers. Using a sample of 93 bidding firms that acquired 101 targets between 1980 and 1995, we find that diversifying acquisitions lead to a negative market reaction and deterioration of the operating performance of the bidder. Announcement and performance gains in each of the three years following the acquisition occur only when bidders expand their core rather than their peripheral lines of business. Our findings suggest that focused acquisitions lead to greater synergies and operating efficiencies than diversifying acquisitions. Intra‐group acquisitions, however, show that bidders do not realise significant gains whether they adopt diversifying or focusing investment strategies by purchasing firms controlled by the Wallenberg and SHB conglomerate groups. Intra‐group targets realize significant gains regardless bidder's investment strategy. Finally, the evidence does not support the view that intra‐conglomerate acquisitions are associated with expropriation of minority shareholders. However, they appear to enhance the control rights of large shareholders of the bidding firm.     

The minimum variance hedge and the bankruptcy risk of the firm

In this paper, we analyze the influence of hedging with forward contracts on the firm's probability of bankruptcy (POB). The minimization of this probability can serve as a substitute for the maximization of shareholders' wealth. It is shown that the popular minimum variance hedge is generally neither necessary nor sufficient for the minimization of the firm's POB. Moreover, our model suggests a correction of the widespread view that a reduction in the variance of the future value of the firm is inevitably accompanied by a reduction in its default risk. We derive an analytical solution for the variance-minimizing hedge ratio of a firm exposed to both input and output price uncertainty that takes into account the issue of correlation. Based on this solution, we provide a graphical analysis to prove our claim that there is a fundamental difference between hedging policies focused on bankruptcy risk and those following conventional wisdom even if positive correlation constitutes a “natural” hedge.     

Hedging Housing Risk in London

This paper investigates the benefits of allowing households to compensate the portfolio distortion due to their housing consumption through investments in housing price derivatives. Focusing on the London market, we show that a major loss from over-investment in housing is that households are forced to hold a very risky portfolio. However, the strong performance of the London housing market means that little is lost in terms of expected returns. Even households with limited wealth are better off owning their home rather than renting and investing in financial assets, as long as they are willing to face the financial risk involved. In this context, access to housing price derivatives would benefit most poor homeowners looking to limit their risk exposure. It would also benefit wealthier investors looking for the high returns provided by housing investments without the costs of direct ownership of properties. Comparisons with French, Swedish and U.S. data provide a broader perspective on our findings.