OPTIMAL LOT SOLUTION TO CARDINALITY CONSTRAINED MEAN–VARIANCE FORMULATION FOR PORTFOLIO SELECTION

The pioneering work of the mean–variance formulation proposed by Markowitz in the 1950s has provided a scientific foundation for modern portfolio selection. Although the trade practice often confines portfolio selection with certain discrete features, the existing theory and solution methodologies of portfolio selection have been primarily developed for the continuous solution of the portfolio policy that could be far away from the real integer optimum. We consider in this paper an exact solution algorithm in obtaining an optimal lot solution to cardinality constrained mean–variance formulation for portfolio selection under concave transaction costs. Specifically, a convergent Lagrangian and contour-domain cut method is proposed for solving this class of discrete-feature constrained portfolio selection problems by exploiting some prominent features of the mean–variance formulation and the portfolio model under consideration. Computational results are reported using data from the Hong Kong stock market.     

The Emerging Role of the European Commission in Merger and Acquisition Monitoring: The Boeing–McDonnell Douglas Case

The object of this study is to evaluate the consequences of the application of the EEC Regulation 4064/89 to non–European companies. We focus on the Boeing–McDonnell Douglas merger case, one of the first non–European mergers considered by the Commission. The analysis of abnormal returns on the two securities shows that the threat of a ban of the merger by the Commission were not perceived as credible at first. But when Boeing decided to ask the support of the American government, just after the decision of the European Commission to extend its investigations to the long term exclusivity contracts, the role of the Commission emerged.     

城市及城市化的重新解读

在评析前人研究的基础上,用新制度经济学的研究方法分析城市、城市化问题,重新定义了城市和城市化的概念,提出了城市是一种制度,城市化是一种制度变迁的理念,并阐释了城市化过程中存在的路径依赖,试图为用新制度经济学研究城市和城市化问题提供一个理论基础.     

Fiscal shocks and their consequences

This paper investigates the response of hours worked and real wages to fiscal policy shocks in the post-World-War II US. We identify these shocks with exogenous changes in military purchases and argue that they lead to a persistent increase in government purchases and tax rates on capital and labor income, and a persistent rise in aggregate hours worked as well as declines in real wages. The shocks are also associated with short lived rises in aggregate investment and small movements in private consumption. We describe and implement a methodology for assessing whether standard neoclassical models can account for the consequences of a fiscal policy shock. Simple versions of the neoclassical model can account for the qualitative effects of a fiscal shock. Once we allow for habit formation and investment adjustment costs, the model can also account reasonably well for the quantitative effects of a fiscal shock.     

Vertical Integration,Foreign Multinationals and Stigler's Hypotheses: An Empirical Test Using Malaysian Data*

In this paper the hypotheses on motives for vertical integration as proposed by Stigler are empirically tested using a panel dataset from Malaysian manufacturing under both fixed‐effects and random‐effects specifications. Because the degree of multinational participation is expected to influence the results of the regression estimates, empirical tests are conducted with and without controlling for the effect of foreign firms’ participation. Depending on model specifications, evidence is found in favor of Stigler's hypotheses where vertical integration is positively related to demand growth and industry concentration. This result is generally consistent with those found in other vertical integration studies. Significantly, the coefficient estimates of the growth variable are not significant and biased downwards if there is no control on the effect of foreign multinationals in the estimation process.     

Should Stochastic Volatility Matter to the Cost-Constrained Investor?

Significant strides have been made in the development of continuous-time portfolio optimization models since Merton (1969) . Two independent advances have been the incorporation of transaction costs and time-varying volatility into the investor's optimization problem. Transaction costs generally inhibit investors from trading too often. Time-varying volatility, on the other hand, encourages trading activity, as it can result in an evolving optimal allocation of resources. We examine the two-asset portfolio optimization problem when both elements are present. We show that a transaction cost framework can be extended to include a stochastic volatility process. We then specify a transaction cost model with stochastic volatility and show that when the risk premium is linear in variance, the optimal strategy for the investor is independent of the level of volatility in the risky asset. We call this the Variance Invariance Principle.     

The sequencing of reform policies in China's agricultural transition*

This paper provides evidence regarding gains due to agricultural market liberalization in China. We empirically identify the different effects that incentive and farm restructuring reforms and gradual market liberalization have on China's agricultural economy during its transition period. We find that average gains within the agricultural sector due to reforms that improved incentives and increased decision‐making authority of producers exceed gains due to market liberalization by a large margin. Our method of analyzing the effects of transition policies on economic performance can be generalized to other reform paths in other transition economies.     

Courts and contract enforcement in transition agriculture: theory and evidence from Poland

The paper investigates theoretically and empirically the role of courts for contract enforcement in transition agriculture. In a survey of 306 Polish farmers conducted in 1999, only 38.5% respondents reported to believe that they could use courts to enforce contracts with their most important customer. Furthermore, those who believed the legal system could be used would accept significant financial losses before taking action. We develop a theoretical model, based on the costs and benefits of court enforcement, which captures the boundary between contracts to be regarded as 'enforceable' and 'not-enforceable' and, simultaneously, the threshold of taking legal action. The empirical analysis strongly supports our model: (1) the farmers' responses can be explained by cost-benefit calculations regarding the use of courts, (2) the legal 'enforceability' of contracts depends not only on the efficiency of the legal system but also on the attributes of the transaction, the contracts and the relationship between buyer and seller and (3) the threshold of taking legal action is significantly influenced by indirect costs of court enforcement, such as the disruption of a valuable business relationship, and by the availability of alternative enforcement mechanisms.     

How important is intra-industry trade in trade growth?

Empirical work on intra-industry trade (IIT) is almost 30 years old. Initial research sought to identify if IIT was a significant share of total trade (TT). The Grubel-Lloyd (GL) index was widely used for this purpose. Interest has since shifted to the changing importance of IITover time. Using movements in the GL index to infer the importance of IIT over time is not only vague, but can be misleading. In this article, we measure the contributions of growth in net trade (NT) and IIT to the growth in TT. To understand changes in IIT over time, we also derive the contributions of imports and exports to the growth in TT, NT, and IIT. All our formulas are illustrated with data for 205 Australian manufacturing industries.     

The Economics of Business Process Design: Motivation,Information and Coordination Within the Firm

This paper presents a transaction cost analysis of the internal business processes of firms. Business processes are collections of activities which are technologically or managerially linked so that they jointly affect value added. Their organisation is characterised by their ‘architecture’—the allocation of responsibilities amongst individuals and groups and communication between them for information and coordination—and their incentive structure. The overall costs of organisation are determined by losses due to imperfect motivation of process members, which flows from the incentive structure, and imperfect information and coordination, which flow from the architecture, together with the resource costs associated with incentives and architecture. Perfect motivation corresponds to ‘team behaviour’ and a quantitative model, based on team theory, indicates how the best architecture depends on the degree interaction between activities comprising the business process.