从马克思主义经济学看庇古分析与科斯分析之异同及其政策启示

针对外部性市场失效引发的生态环境问题,文章从讨论庇古分析与科斯分析的本质着手,运用马克思主义经济学关于个别生产与社会生产之关系的观点,引入价值体系与价格体系的数学规划模型,通过模型分析,从产权过程的角度,讨论庇古分析与科斯分析之并同和不完备性,从制度工具论的角度,归纳了两大分析的政策启示。     

货币政策对股票价格行为的影响实证分析

文章以影响股票价格的理论为基础,采用现代计量技术,采用2005年1月至2007年6月的月度时间序列数据,研究了汇率、存款准备金率以及利率、货币供应量等宏观经济因素对股票价格的影响。从2005年6月以来我国A股市场股票价格的持续上涨,其主要原因是经济的高速增长、人民币升值以及充足的货币供应量;而加息与提高存款准备金率对股票价格变化的影响有限。     

Modelo de gestión logística para pequeñas y medianas empresas en México

The market opening and the globalization of supply chains, demand a structural changes in which logistics has a strategic role. Nowadays, clients evaluate product quality, its value added and its availability in time and form, which implies a need to make the process efficient. Several experts have proposed some logistics management models to increase competitiveness in the market, but some of these models are too ambitious for small and medium sized enterprises (SMEs) due to their informal structure and their lack of technical knowledge; other models make indirect reference to the internal information flows, which include whole system disintegration because of the weak interrelation among the different areas. In Mexico, SMEs represent 4.2%, they generate 31.5% of employment and provide 37% of the gross domestic product; that is why it is important to reinforce their competitive position in the market. This research presents the design of a conceptual model of logistic management for SMEs which could provide comprehensive solution through control of the variables involved in the logistics process; to verify that the variables considered in each identified dimension are correct factor analysis was used.     

Macroprudential policy and imbalances in the euro area

Since its creation the euro area suffered from imbalances between its core and peripheral members. This paper checks whether macroprudential policy applied to the peripheral countries could contribute to providing more macroeconomic stability in this region. To this end we build a two-economy macrofinancial model and simulate the effects of macroprudential policy (regulating the loan-to-value ratio) when the core and the periphery are exposed to asymmetric shocks. We find that macroprudential policy is able to substantially lower the amplitude of credit and output fluctuations in the periphery. However, for the policy to be effective, it should be decentralized. Very similar conclusions hold when welfare is considered as the optimality criterion.     

Quote inefficiency in options markets

In an arbitrage-free economy with non-zero bid-ask spreads the existence of payoffs whose price is lower than the price of a dominated payoff cannot be discarded in general. However, when the former price corresponds to trivial portfolios which involve buying or selling one unit of the basis assets, its presence, although not an arbitrage, is a severe market anomaly which we refer to as an inefficient quote. In an empirical study, we report evidence that indicates that in options markets both the frequency and the magnitude of these anomalies are substantial and we document puzzling patterns in their behavior.     

Does Accrual Management Impair the Performance of Earnings‐Based Valuation Models?

This study examines how accrual manipulations affect firm valuation in the years surrounding the passage of the Sarbanes‐Oxley Act (SOX). We compare the absolute percentage pricing errors of RIM and DCF valuation models for a group of US firms suspected to have engaged in accrual manipulations to avoid a small loss or a small earnings decline vs. ‘Normal’ firms matched on industry, year and size. We find that RIM can better estimate intrinsic value than DCF for the matched Normal firms in the pre‐SOX period, but not so for accrual manipulators, and that SOX mitigates the harmful effect of accrual manipulations, completely eliminating the difference in RIM's accuracy advantage over DCF between Normal firms and accrual manipulators. As a further analysis, we redefine Suspect firms as real‐activity manipulators and find a significant across‐group difference in accuracy wedge in both sample periods, implying that SOX has prompted firms to favor real‐activity manipulations over accrual manipulations.     

我国煤炭资源税从价计征的局限性研究——基于征税效果和效率的预评价

从征税效果和效率的视角,对资源税从价征收进行了预评价。评价结果表明,从价计征改革存在2大局限性,一方面无法达到"地方政府摆脱资源大省、财政小省困境"和"提高回采率、保护煤炭资源"等预期效果;另一方面,会造成征税的双重超额负担,导致征税低效率。在此基础上,建议应从整体而非局部推动煤炭资源税费改革,系统地进行煤炭资源税收体系再设计。     

上市动机、投资者情绪与首次公开募股市场收益

文章以发行人筹资收益最大化为假设,对市场热季周期下发行人、承销商与投资人三者之间的博弈过程以及投资者情绪对首次公开募股(IPO)市场定价的影响机制进行研究.研究结果表明,发行人最优发行数量小于市场需求数量、承销商定价低于市场需求价格的目的在于确保发行成功和获取日后收益;投资者高亢的投资情绪可以对IPO市场短期收益正偏和长期收益负偏成为普遍现象进行解释.     

Accommodating spatial correlation across choice alternatives in discrete choice models: an application to modeling residential location choice behavior

This paper presents a modeling methodology capable of accounting for spatial correlation across choice alternatives in discrete choice modeling applications. Many location choice (e.g., residential location, workplace location, destination location) modeling contexts involve choice sets where alternatives are spatially correlated with one another due to unobserved factors. In the presence of such spatial correlation, traditional discrete choice modeling methods that are often based on the assumption of independence among choice alternatives are not appropriate. In this paper, a Generalized Spatially Correlated Logit (GSCL) model that allows one to represent the degree of spatial correlation as a function of a multi-dimensional vector of attributes characterizing each pair of location choice alternatives is formulated and presented. The formulation of the GSCL model allows one to accommodate alternative correlation mechanisms rather than pre-imposing restrictive correlation assumptions on the location choice alternatives. The model is applied to the analysis of residential location choice behavior using a sample of households drawn from the 2000 San Francisco Bay Area Travel Survey (BATS) data set. Model estimation results obtained from the GSCL are compared against those obtained using the standard multinomial logit (MNL) model and the spatially correlated logit (SCL) model where only correlations across neighboring (or adjacent) alternatives are accommodated. Model findings suggest that there is significant spatial correlation across alternatives that do not share a common boundary, and that the GSCL offers the ability to more accurately capture spatial location choice behavior.