Optimal stopping with dynamic variational preferences

We solve optimal stopping problems in uncertain environments for agents assessing utility by virtue of dynamic variational preferences as in Maccheroni, Marinacci and Rustichini (2006) [16] or, equivalently, assessing risk in terms of dynamic convex risk measures as in Cheridito, Delbaen and Kupper (2006) [4]. The solution is achieved by generalizing the approach in Riedel (2009) [21] introducing the concept of variational supermartingales and variational Snell envelopes with an accompanying theory. To illustrate results, we consider prominent examples: dynamic multiplier preferences and a dynamic version of generalized average value at risk introduced in Cheridito and Tianhui (2009) [5].     

Diversification and tunneling: Evidence from Indian business groups

We provide evidence suggesting an important yet largely unexplored motive for the diversified structure of emerging economy business groups is to facilitate expropriation of minority shareholders by controlling insiders through tunneling. Using firm level panel data from India, and defining the core firm of a group as the one with the largest asset base, we find that the relatedness of the activity of a group affiliate to the activity of the core firm is correlated with the wedge between control and cash flow rights of insiders as well as with the opacity in insider ownership. Firms with ownership-control wedge lower and ownership opacity higher relative to a group’s core firm are more likely to be in activities unrelated to that of the core firm. Our findings are strengthened by evidence of tunneling in the same direction, from affiliates with wedge equal to or higher than that of the core firm to affiliates with wedge lower than that of the core firm. Taken together this suggests an expropriation motive for diversification: affiliate firms are located away from a business group’s core firm to serve as destination points for funds tunneled from the group’s core.     

A new test for linear inequality constraints when the variance–covariance matrix depends on the unknown parameters

We extend Hansen’s (2005) test to testing hypotheses involving general inequality constraints where the variance–covariance matrix of the functions in the constraints depends on the unknown parameters. The test can be applied to a wider class of problems than Wolak’s (1991).     

Post-privatization corporate governance and firm performance: The role of private ownership concentration,identity and board composition

We examine and analyze the post-privatization corporate governance of a sample of 52 newly privatized Egyptian firms over a period of 10 years, from 1995 to 2005. We look at the ownership structure that results from privatization and its evolution; the determinants of private ownership concentration; and the impact of private ownership concentration, identity and board composition on firm performance. We find that the state gives up control over time to the private sector, but still controls, on average, more than 35% of these firms. We also document a trend in private ownership concentration over time, mostly to the benefit of foreign investors. Firm size, sales growth, industry affiliation, and timing and method of privatization seem to play a key role in determining private ownership concentration. Ownership concentration and ownership identity, in particular foreign investors, prove to have a positive impact on firm performance, while employee ownership concentration has a negative one. The higher proportion of outside directors and the change in the board composition following privatization have a positive effect on firm performance. These results could have some important policy implications where private ownership by foreign investors seems to add more value to firms, while selling state-owned enterprises (SOEs) to employees is not recommended. Also, the state is highly advised to relinquish control and allow for changes in the board of directors following privatization as changing ownership, per se, might not have a positive impact on firm performance unless it is coupled with a new management style.     

Modeling unemployment as an inventory: A multicointegration approach

We examine the dynamic phenomenon of unemployment as a constantly changing inventory of unemployed individuals. We focus on the possibility raised by Elsby et al. (2009) of an innate “inseparability” between the flows into and out of unemployment. Multicointegration, introduced by Granger and Lee (1989), offers a natural way to model the level of unemployment as an inventory. We find that there is multicointegration between inflows into and outflows from unemployment and the level of unemployment itself. By identifying this multicointegrating relationship, we are able to specify an error correction model for unemployment, improving forecasting ability.     

Understanding the effects of technology shocks

The research led by Gali (AER 1999) and Basu et al. (AER 2006) raises two important questions regarding the validity of the RBC theory: (i) How important are technology shocks in explaining the business cycle? (ii) Do impulse responses to technology shocks found in the data reject the assumption of flexible prices? Using an RBC model, this paper argues that the conditional impulse responses of the U.S. economy to technology shocks are not grounds to reject the notion that technology shocks are the main driving force of the business cycle and the assumption of flexible prices, in contrast with the conclusions reached by the literature.     

Efficiency and its determinants in pharmaceutical industries: ownership,R&D and scale economy

The purpose of this article is to measure the efficiency of pharmaceutical firms and identify their determinants using Korean and American samples from 1992 to 2004. We document some stylized facts in the patterns and sources of efficiency change in Korean and American pharmaceutical firms. The evidence shows that ownership structure can substantially influence the efficiency of pharmaceutical firms. Especially, institutional ownership rate affects corporate efficiencies negatively, corroborating the myopic institutional investor hypothesis. The hypothesis is supported by both Korean and American samples. However, we find evidence that foreign ownership in Korea promotes efficiency of pharmaceutical firms. It is shown that R&D intensity is positively related to contemporaneous largest ownership rate and prior foreign ownership rate in Korean pharmaceutical firms. In contrast, little evidence is found on the relationship between ownership structure and R&D intensity in the American pharmaceutical industry. These empirical results are robust even after we check the causal links among efficiency, R&D and ownership.     

On the folk theorem with one-dimensional payoffs and different discount factors

Proving the folk theorem in a game with three or more players usually requires imposing restrictions on the dimensionality of the stage-game payoffs. Fudenberg and Maskin (1986) assume full dimensionality of payoffs, while Abreu et al. (1994) assume the weaker NEU condition (“nonequivalent utilities”). In this note, we consider a class of n-player games where each player receives the same stage-game payoff, either zero or one. The stage-game payoffs therefore constitute a one-dimensional set, violating NEU. We show that if all players have different discount factors, then for discount factors sufficiently close to one, any strictly individually rational payoff profile can be obtained as the outcome of a subgame-perfect equilibrium with public correlation.     

Large deviations and multinomial probit choice

We consider a discrete choice model in which the payoffs to each of an agent?s n actions are subjected to the average of m i.i.d. shocks, and use tools from large deviations theory to characterize the rate of decay of the probability of choosing a given suboptimal action as m approaches infinity. Our model includes the multinomial probit model of Myatt and Wallace (2003) [5] as a special case. We show that their formula describing the rates of decay of choice probabilities is incorrect, provide the correct formula, and use our large deviations analysis to provide intuition for the difference between the two.     

最终控制人特征、政府控制与公司价值

本文采用中国A股上市公司最终控制人属性、控制权比例、控制权与所有权背离程度、控制链长度等因素对上市公司价值进行了研究。回归结果表明最终控制人对上市公司的控制权与公司价值之间呈非线性的正U型关系，而所有权与控制权背离程度与公司价值的关系并不显著。政府目标多元化导致政府控制的上市公司其目标并不一定是股东价值最大化，政府附加的社会责任给上市公司的价值带来负面影响，这种负面影响主要来自于下级政府部门。政府对上市公司控制链越长，企业受到政府的干预就越少，公司的价值就会越高；而控制链对于非国家最终控制的公司的价值影响并不显著。本文还发现不同非政府实体最终控制的上市公司之间价值不存在显著差异。     

An improved generalized moments estimator for a spatial moving average error model

Following Arnold and Wied (2010), we suggest an improved generalized moments estimator for the spatial moving average error model which takes explicitly into account that the moment conditions are based on OLS residuals rather than the true disturbances.     

Reluctant regulation

We study the effect of state ownership on the market-to-book ratios of publicly traded European utilities from 1994 to 2005. We find that when the company is subject to independent regulation, state ownership seems positively associated with firm value. This relation tends to appear in countries where weak checks and balances and political fragmentation do not constrain the power of the executive. Our results suggest that, where political institutions are weak, politicians may influence regulatory agencies in order to benefit state-owned firms.     

Disease and development: The role of life expectancy reconsidered

This note estimates the causal effect of life expectancy on per capita income and tests the hypothesis of a non-monotonic effect using finite mixture models. The results confirm the hypothesis and qualify recent evidence for a negative effect by Acemoglu and Johnson (2007).     

Biogeographical conditions, the transition to agriculture and long-run growth

We use new data on the timing of the transition to agriculture, developed by Putterman and Trainor (2006), to test the theory of Diamond (1997) and Olsson and Hibbs (2005) that an earlier transition is reflected in higher incomes today. Our results confirm the theory, even after controlling for institutional quality and other geographical factors. The date of transition is correlated with prehistoric biogeography (the availability of wild grasses and large domesticable animal species). The factors conducive to high per capita incomes today are good institutions, an early transition to agriculture, access to the sea and a low incidence of fatal malaria. Geographical influences have been at work in all of these proximate determinants of per capita income.     

我国上市公司风险管理决策的实证研究

本文应用公司财务理论,对我国上市公司风险管理费用的决定因素进行实证研究。从公司的财务困境成本、代理成本、税率等因素出发讨论了公司风险管理决策行为,并建立了单变量和多变量模型分析我国公司风险管理费用的决定因素。在风险管理方面,研究表明,对于我国公司在风险管理方面的决策行为,地方政府的保护行为有很大的影响。     

Using patent analysis to establish technological position: Two different strategic approaches

Discussions on business strategy formation in the past 50 years can be separated into two categories: the inside-out and the outside-in approach. Technology is a critical factor when manager formulate their business strategy, and patents have served as an important indicator of technology. A patent portfolio can be used to understand the capabilities of a firm, as an inside resource pattern; and the patent citation of firms can be used to find the relationship of a firm, as an outside dependency. This study uses patent information to establish an effective model for the technological position of business methods. The 5 by 6 matrix was generated and four situations between firms were induced. Researchers and managers can use that matrix and situations to recognize the real competitors or cooperators, and formulate the technological strategies which include competition, cooperation, or complementary cooperation.     

Belief-free equilibria in games with incomplete information: Characterization and existence

We generalize the results of Hörner and Lovo (2009) [15] to N-player games with arbitrary information structure. First, we characterize the set of belief-free equilibrium payoffs under low discounting as the set of feasible payoffs that are individually rational, jointly rational, and incentive compatible. Second, we provide necessary and sufficient conditions on the information structure for this set to be non-empty.     

Core competencies,matching and the structure of foreign direct investment

We develop a matching model of foreign direct investment to study how multinational firms choose between greenfield investment, acquisitions and joint ownership. Firms must invest in a continuum of tasks to bring a product to market. Each firm possesses a core competency in the task space, but the firms are otherwise identical. For acquisitions and joint ownership, a multinational enterprise (MNE) must match with a local partner that may provide complementary expertise within the task space. However, under joint ownership, investment in tasks is shared by multiple owners and, hence, is subject to a holdup problem that varies with contract intensity. In equilibrium, ex ante identical multinationals enter the local matching market, and, ex post, three different types of heterogeneous firms arise. Specifically, the worst matches are forgone and the MNEs invest greenfield; the middle matches operate under joint ownership; and the best matches integrate via full acquisition. We link the firm‐level model to cross‐country and industry predictions and find that a greater share of full acquisitions occur between more proximate markets, in hosts with greater revenue potential and within contract‐intensive industries. Using data on partial and full acquisitions across industries and countries, we find robust support for these predictions.     

多元化战略对管理层激励的影响--来自中国资本市场的经验证据

本文利用2001-2004年中国上市公司的数据,使用面板数据模型,对中国上市公司多元化与管理层激励之间的关系进行了检验.结果表明:现金薪酬水平与公司价值负相关,高管人员持股比例与公司价值之间是非线性关系,激励并没有发挥其应有的作用;多元化对公司价值的影响并不显著.当控制了影响多元化的公司内部因素后,我们发现国有股占主导地位的公司,多元化程度与现金薪酬之间是负向关系;多元化程度与管理层持股比例之间是正向关系.多元化程度与在职消费正相关.多元化决策是管理当局希望从多元化中获取更多的剩余收益和隐性的私人利益.     

Can contracts solve the hold-up problem? Experimental evidence

In the contract-theoretic literature, there is a vital debate about whether contracts can mitigate the hold-up problem, in particular when renegotiation cannot be prevented. Ultimately, this question has to be answered empirically. As a first step, we have conducted a laboratory experiment with 960 participants. We consider investments that directly benefit the non-investing party. While according to standard theory, contracting would be useless if renegotiation cannot be ruled out, we find that option contracts significantly improve investment incentives compared to a no-contract treatment. This finding might be attributed to Hart and Moore?s (2008) recent idea that contracts can serve as reference points.