Short sales, price pressure, and the stock price response to convertible bond calls

The announcement of a convertible bond call is associated with an average contemporaneous abnormal stock price decline of 1.75% and an ensuing price recovery in the conversion period. A price fall and the subsequent recovery suggest price pressure as the explanation for the announcement effect. However, in general the option to convert is not exercised early and hence, the increase in the number of shares outstanding does not occur at the announcement date. Instead, this paper argues and provides evidence that hedging-induced short selling causes at least part of the short-run price pressure.     

现代企业委托代理问题的“中庸之道”

孔子提出的“中庸之道”从根本上说是一种管理思想和方法,它要求人们作任何事情都要遵循适度原则,这对现代企业中的委托代理问题同样具有重要意义。在这一思想方法的指导下,本文论证了解决委托代理问题的最优激励机制设计,寻找激励与监督的均衡点。     

具有网络效应的产品的价格竞争分析

具有网络效应的产品是指消费者在消费这种产品时所获得的效用会随着购买这种产品的其他消费者数量的增加而不断增加的产品。本文通过建立一个有两个厂商的离散动态决策模型，研究在分散决策的市场经济中生产具有网络效应的产品的厂商的价格决策对产品市场占有率的影响，价格决策影响产品市场占有率的动态演化的过程，以及市场均衡的务件和特征，包括产品不占有市场、占有部分市场以及上有今都市场的价格条件。     

公司价值评估中管理者柔性的价值评估研究

现在公司价值评估方法往往没有考虑到对管理柔性价值定价问题。由于管理柔性价值定价是一种类似期权的定价，因此本运用Black—Scholes期权定价模型和买权卖权平价关系，定价管理柔性价值，来完善公司价值评估中的折现现金流量模型。     

Deregulation,news releases,and price discovery

We hypothesize that the firm’s regulatory environment influences the sensitivity of its equity value to information. Using intraday stock price data of utilities operating in differing regulatory environments we test for systematic differences between the responsiveness of stock prices of utility firms operating in deregulated and regulated environments to a common information set. Our findings reveal sharp differences in responses, with those of utilities operating in deregulated environments the strongest, and the responses of utilities in highly regulated environments the weakest. While the evidence supports our hypothesis, in a broader sense, the evidence suggests that deregulation aids in the process of price discovery. We also find evidence that suggests that deregulation, per se, does not lead to higher stock price volatility.      

Winner-take-all price competition

Summary. We analyze an oligopoly model of homogeneous product price competition that allows for discontinuities in demand and/or costs. Conditions under which only zero profit equilibrium outcomes obtain in such settings are provided. We then illustrate through a series of examples that the conditions provided are “tight” in the sense that their relaxation leads to positive profit outcomes. Received: April 7, 2000; revised version: September 14, 2000     

货币政策的粘性均衡汇率效应模型及人民币汇率定价的弹性分析

本文以开放的宏观经济为框架、以厂商利润最大化为微观经济基础、以严格的数学推导为逻辑纽带、以粘性价格为理论依据、以购买力平价的微分冲击形式为理论基础，提出并构建了两国货币政策的粘性均衡汇率效应模型。应用模型，本文对1992～2002年的人民币粘性均衡汇率进行了定价，并对2003年的定价进行了预测。以定价汇率及其预测为标准，对1992～2003年的人民币汇率偏离与经常性项目的关系，进行了弹性分析。根据模型与实证分析，获得了一些重要结论。     

中国的房价与地价:理论、实证和政策分析

本文采用四象限模型、格兰杰因果检验和误差修正模型等分析方法，从理论、实证和政策等方面对中国房价与地价关系以及市场结构和政府供地方式的转变对二者关系的影响进行系统、深入地研究，并对进一步规范房地产市场秩序，理顺地价和房价形成机制等提出政策建议。研究结果表明，短期内房价决定地价，长期内二者相互影响。与协议出让方式相比，土地招拍挂出让通过促进土地市场的买方竞争、降低房地产增量市场的垄断性，在显化土地价格的同时，降低了地价对房价的影响程度。     

上海A股市场股价波动相互影响能力实证研究

股票市场中股票价格的波动是相互影响的,但不同的股票其价格波动时对其他股票价格行为的影响能力是不同的。本文通过对我国上海A股市场的实证分析表明,有少数股票其价格波动时对其他股票价格行为有很强的影响能力,而大多数股票的这种影响能力很小。此外,单个股票价格波动时引起其他股票价格涨、跌的能力一般都有显著差异。     

On strategic complementarity conditions in Bertrand oligopoly

Summary. For Bertrand duopoly with linear costs, we establish via a single (counter-)example that: (i) A new monotone transformation of the firms' profit functions may lead to the supermodularity of transformed profits when the standard log and identity transformations both fail to do so, and (ii) Topkis's notion of critical sufficient condition for monotonicity of a Bertrand firm's best-reply correspondence cannot be extended to rely only on positive unit costs. Received: January 16, 2001; revised version: March 20, 2002 RID="*" ID="*" This work was completed while the first author was visiting the Institute for Industrial Economics at the University of Copenhagen during Spring 2000. Their financial support and stimulating research environment are gratefully acknowledged. The views expressed here are those of the authors and should not be attributed to the European Commission. Correspondence to: R. Amir