Pricing efficiency of the S&P 500 index market: Evidence from the Standard & Poor's Depositary Receipts

Standard & Poor's Depositary Receipts (SPDRs) are exchange traded securities representing a portfolio of S&P 500 stocks. They allow investors to track the spot portfolio and better engage in index arbitrage. We tested the impact of the introduction of SPDRs on the efficiency of the S&P 500 index market. Ex‐post pricing efficiency and ex‐ante arbitrage profit between SPDRs and futures were also examined. We found an improved efficiency in the S&P 500 index market after the start of SPDRs trading. Specifically, the frequency and length of lower boundary violations have declined since SPDRs began trading. This result is consistent with the hypothesis that SPDRs facilitate short arbitrage by simplifying the process of shorting the cash index against futures. Tests of pricing efficiency comparing SPDRs and futures suggested that index arbitrage using SPDRs as a substitute for program trading in general results in losses. Although short arbitrages earn a small profit on average, gains are statistically insignificant. A trade‐by‐trade investigation showed that prices are instantaneously corrected after the presence of mispricing signals, introducing substantial risk in arbitraging. Evidence in general supported pricing efficiency between SPDRs and the S&P 500 index futures—both ex‐post and ex‐ante. © 2002 Wiley Periodicals, Inc. Jrl Fut Mark 22:877–900, 2002     

Panel quantile regressions for estimating and predicting the value-at-risk of commodities

Using a flexible panel quantile regression framework, we show how the future conditional quantiles of commodities returns depend on both ex post and ex ante uncertainty. Empirical analysis of the most liquid commodities covering main sectors, including energy, food, agriculture, and precious and industrial metals, reveal several important stylized facts. We document common patterns of the dependence between future quantile returns and ex post as well as ex ante volatilities. We further show that the conditional returns distribution is platykurtic. The approach can serve as a useful risk management tool for investors interested in commodity futures contracts.     

组织间权威对交易分配和投资积极性的影响

企业投资决策是事前行为,而交易分配事后才能明确,当企业无法控制交易分配时,其投资积极性会受影响。论文从独立决策、卖方控制和买方控制三方面分析了组织间权威在交易分配中的作用,认为在独立决策时,企业因事后交易的不确定性而存在投资不足;而在卖方控制或买方控制的情况下,拥有权威的一方存在投资过剩,不拥有权威的一方则投资积极性不足。因此,当一方的投资对于社会总收益创造更为重要时,应由其拥有权威。     

Per piece or per kilogram? Default-unit effects in retailing

Retailers offer a variety of products either per unit or per weight. Depending on the product category, consumers may find either one of these pricing strategies typical and the default. Especially online retailers are increasingly using unit-based prices, which is the non-default for many produce categories. So far, consequences resulting from non-default pricing strategies are unclear. This study addresses the questions of whether and how pricing strategies affect consumer behavior. In a series of four experiments, we show that default pricing strategies exist in the marketplace and that consumers prefer products that retailers offer using default pricing strategies. We also demonstrate that this behavior is due to uncertainty issues when assessing prices in non-default pricing strategies. Furthermore, we elaborate on the influence of weight expectations and explicitly stated weight information on this default-unit effect. The findings suggest that retailers can mitigate negative effects resulting from non-default pricing strategies by providing weight information.     

Crisis costs and debtor discipline: the efficacy of public policy in sovereign debt crises

Recent debate on the reform of the international financial architecture has highlighted the potentially important role of the official sector in crisis management. We examine how such public intervention in sovereign debt crises affects efficiency, ex ante and ex post. Our results shed light on the scale of capital inflows and the implications for debtor country output of such a regime. The efficacy of measures such as officially sanctioned stays on creditor litigation depend critically on the quality of public sector surveillance and the size of the costs of sovereign debt crises.     

顾客参与创新:第三方消费者对产品创新性的感知

作为顾客参与创新的目标消费群体,第三方消费者如何评价顾客参与创新的成果具有重要的意义。文章通过社会认知理论的视角探讨了顾客参与创新对第三方消费者的影响。通过三组实验发现,顾客参与创新会显著促进第三方消费者对产品创新性的感知,这种创新性感知受到第三方消费者对参与创新顾客身份认同的中介作用。同时,第三方消费者与参与创新顾客的关系紧密性以及参与创新过程的透明度会调节顾客参与创新与身份认同感之间的关系,进而影响第三方消费者对顾客参与创新成果感知创新性的评价。其中,第三方消费者与参与创新顾客的关系紧密性越强,其对参与创新顾客的身份认同度越高;顾客参与创新过程的透明度越高,第三方消费者对参与创新顾客的身份认同感越高。     

DYNAMIC PORTFOLIO OPTIMIZATION WITH A DEFAULTABLE SECURITY AND REGIME‐SWITCHING

We consider a portfolio optimization problem in a defaultable market with finitely‐many economical regimes, where the investor can dynamically allocate her wealth among a defaultable bond, a stock, and a money market account. The market coefficients are assumed to depend on the market regime in place, which is modeled by a finite state continuous time Markov process. By separating the utility maximization problem into a predefault and postdefault component, we deduce two coupled Hamilton–Jacobi–Bellman equations for the post‐ and predefault optimal value functions, and show a novel verification theorem for their solutions. We obtain explicit constructions of value functions and investment strategies for investors with logarithmic and Constant Relative Risk Aversion utilities, and provide a precise characterization of the directionality of the bond investment strategies in terms of corporate returns, forward rates, and expected recovery at default. We illustrate the dependence of the optimal strategies on time, losses given default, and risk aversion level of the investor through a detailed economic and numerical analysis.     

Social Media Communications and Marketing Strategy: A Taxonomical Review of Potential Explanatory Approaches

The growth of social media has captured the attention of companies, which have responded by increasing their advertising efforts toward social media users. Previous studies have devoted considerable effort to developing social media marketing strategies, but minimal effort has focused on examining the types of messages presented on firms’ social media platforms to communicate with customers. Practitioners face the challenge of identifying which types of social media message content to choose. In addressing this challenge, this article provides a comprehensive framework of social media content strategy, delivery, and impact on the consumers, including a taxonomical approach that helps firms’ understanding of firm-generated content on social media platforms.     

论政府隐性担保对我国证券市场微观效率的影响

政府隐性担保机制是我国证券市场运行的基础,也是市场风险聚集的根源。这种隐性担保通过一系列制度性安排造成市场主体过于追求市场隐含的政策性租金而忽视对市场价值体系的培育与发现,造成市场事前筛选和事后监督机制失效,使投资者决策面临更加不稳定的环境,增加了市场的不确定性。     

Risk and ex ante cost of equity estimates of emerging market firms

We examine the empirical relationship between estimates of ex ante cost of equity and risk for a sample of individual emerging market equities for the period 1990–2000. The ex ante cost of equity estimates are obtained using the residual income valuation model. As in studies that use mean realized returns on emerging market indexes, a measure of total risk (return volatility) is the most significant risk factor in explaining ex ante expected return estimates. For emerging market equities with substantial investability to global investors, global beta adds some explanatory power.     

Lower‐boundary violations and market efficiency: Evidence from the German DAX‐index options market

The informational efficiency of the market for options on the German stock index DAX is examined using intraday transactions data. Problems of previous studies on options‐market efficiency, arising from dividend estimation and the early‐exercise effect, are avoided, because the DAX is a performance index and DAX options are European options. Ex‐post and ex‐ante tests are carried out to simulate trading strategies that exploit irrational lower‐boundary violations of observed option prices. Because the lower‐boundary conditions are solely based on arbitrage considerations, the test results do not depend on the assumption that investors use a particular option‐pricing model. The investigation shows that ex‐post profits are, in general, dramatically reduced when the execution of arbitrage strategies is delayed and/or transaction costs are accounted for. However, arbitrage restrictions, which rely on short selling of the component stocks of the index, tend to be violated more often and with higher persistence. An analysis of consecutive subsamples suggests that, over time, traders have been subjected to a learning process when pricing this relatively new instrument. © 2000 John Wiley & Sons, Inc. Jrl Fut Mark 20: 405–424, 2000     

An entrepreneur's choice of venture capitalist or angel-financing: A behavioral game-theoretic approach

We develop a game-theoretic model that analyzes the effects of economic and behavioral characteristics on an entrepreneur's choice of financier (venture capitalist or angel). After the entrepreneur has chosen his financier, the dyad faces double-sided moral hazard problems in the form of ex ante effort-shirking, and ex post project-expropriation. In making his choice of financier, the entrepreneur trades-off the following factors. The venture capitalist has higher value-creating abilities than the angel. However, the entrepreneur anticipates a closer, more empathetic and trusting relationship with the angel. Entrepreneur/angel empathy and trust mitigates the double-sided shirking and expropriation threats. Our model contributes to two strands of venture capitalist research; the entrepreneur's choice of financier in the face of double-sided moral hazard problems, and the effect of behavioral factors, such as empathy and trust, on the creation of ‘relational rents’.     

Social media: The new hybrid element of the promotion mix

The emergence of Internet-based social media has made it possible for one person to communicate with hundreds or even thousands of other people about products and the companies that provide them. Thus, the impact of consumer-to-consumer communications has been greatly magnified in the marketplace. This article argues that social media is a hybrid element of the promotion mix because in a traditional sense it enables companies to talk to their customers, while in a nontraditional sense it enables customers to talk directly to one another. The content, timing, and frequency of the social media-based conversations occurring between consumers are outside managers’ direct control. This stands in contrast to the traditional integrated marketing communications paradigm whereby a high degree of control is present. Therefore, managers must learn to shape consumer discussions in a manner that is consistent with the organization's mission and performance goals. Methods by which this can be accomplished are delineated herein. They include providing consumers with networking platforms, and using blogs, social media tools, and promotional tools to engage customers.     

Application of production standards in complex organizations under uncertainty

This article explores the optimal determination of production (quantitative) standards under alternative assumptions concerning the ability of complex organizations to adjust variable inputs as the price of output becomes known.The model allows for transaction costs associated with ex ante and ex post input acquisitions (e.g., contracting for labor services). When such input transaction costs are not observable by top management, pecuniary incentive schemes based on ex post performance are considered. We show that standard-based compensation schemes can be built into the ex post optimization model so that the profit-maximizing production standards and the incentive designs are simultaneously determined.     

Electronic word-of-mouth via consumer-opinion platforms: What motivates consumers to articulate themselves on the Internet?

Through Web-based consumer opinion platforms (e.g., epinions.com), the Internet enables customers to share their opinions on, and experiences with, goods and services with a multitude of other consumers; that is, to engage in electronic word-of-mouth (eWOM) communication. Drawing on findings from research on virtual communities and traditional word-of-mouth literature, a typology for motives of consumer online articulation is developed. Using an online sample of some 2,000 consumers, information on the structure and relevance of the motives of consumers’ online articulations is generated. The resulting analysis suggests that consumers’ desire for social interaction, desire for economic incentives, their concern for other consumers, and the potential to enhance their own self-worth are the primary factors leading to eWOM behavior. Further, eWOM providers can be grouped based on what motivates their behavior, suggesting that firms may need to develop different strategies for encouraging eWOM behavior among their users.     

Why strategy is key for successful social media sales

Many successful companies spend substantial time and effort engaging with potential consumers on social media sites. They determine how consumers spend their time online and develop interesting content to increase awareness and enjoyment of the brand—often only to lose those potential customers because the purchase process becomes too difficult once consumers have decided to buy the product. New technology recently introduced by third-party vendors allows companies to offer a sales option directly on social media websites such as Facebook and Instagram. In this article, we present the effects on the consumer decision process created by the ‘Buy Now’ option across the consideration, evaluation, purchase, and post-purchase stages. We compare and contrast three distinct decision models: (1) traditional media only, (2) traditional media and social media with only a communication capability, and (3) traditional media and social media with the added function of immediate purchase. We argue that though the possibility of buying on social media will decrease the number of brands considered and evaluated, the number of purchases and amount of brand advocacy will increase significantly due to the ease of purchase. We conclude with some recommendations on future research.     

Antecedents and consequences of idiosyncratic deals: A frame of resource exchange

This study examines the antecedents and consequences of both timing and content of idiosyncratic deals (i-deals) for attracting and retaining valuable employees. A resource exchange frame theorizes the influence pattern of personal individualism value, social skill, and perceived insider status on i-deals timing. Individualism and social skill are expected to relate to both ex ante and ex post i-deals; perceived insider status is anticipated to relate only to ex post i-deals. The frame also suggests that i-deals’ content and personal development relate primarily to relational and balanced psychological contracts; the other ex post i-deals, flexibility and workload reduction relate to transactional psychological contracts. The frame was tested with data collected from 289 Chinese employees in the telecommunication industry.     

Assessing the Efficiency of Risk Mitigation Strategies in Supply Chains

Mitigating supply chain risk is a critical component of a company's overall risk management strategy. Drawing upon Contingency Theory, we posit that the appropriateness and effectiveness of risk mitigation strategies are contingent on the internal and external environments and that there is no one‐size‐fits‐all strategy. While literature on risk management has proposed a variety of tools and techniques for effectively evaluating and managing supply chain risks, comprehensive assessment of the efficiencies of alternative risk mitigation strategies has not been addressed in the literature. Such an assessment will help managers select the appropriate mitigation strategy for a given decision‐making environment. To this end, this study is first of its kind in evaluating and proposing efficient supply chain risk mitigation strategies in the presence of a variety of risk categories, risk sources, and supply chain configurations. We combine an empirically grounded simulation methodology with data envelopment analysis and nonparametric statistical methods to analyze and rank alternative mitigation strategies. We find that the more efficient strategies focus on flexibility rather than on redundancy for supply chain failures. Our research presents several interesting and useful managerial insights for deciding what strategies are most capable of mitigating risks in a variety of contexts.     

Value‐driven Internet shopping: The mental accounting theory perspective

When faced with competition and the ease with which customers can compare prices across sellers, Internet vendors often lower prices in a bid to increase sales. However, recent research reports that even price‐sensitive customers do not always purchase from Internet vendors offering the lowest prices. In contrast, value has been considered a key motivator of customer decision making in economics and marketing. However, little is known about the role and effect of value in Internet shopping. This study examines online customer purchase decision making from the value perspective based on mental accounting theory. This study also identifies monetary (perceived price) and non‐monetary (perceived risk, convenience, and pleasure) determinants of value. This study further explains how the individual determinants affect online purchase decision making directly and indirectly though value perception. The findings of this study offer Internet vendors practical suggestions for increasing online sales. This study, with its results, also helps advance knowledge of electronic commerce. © 2009 Wiley Periodicals, Inc.     

Consumer Preferences Toward Product Attributes of Dietary Supplements Under Mandatory Food Traceability Systems in Korea

Korea, mandatory Food Traceability System (FTS) regulation on dietary supplements has been enforced since the end of 2014, which has allowed government to collect electronic data to trace food. The aim of this study was to determine which additional attributes of dietary food supplements are preferred by consumers and to assess the value of consumers’ willingness to pay (WTP) for these attributes. This investigation revealed that gender, age, income, and awareness were the most frequently reported drivers of purchase behavior. Gender was the most influential socioeconomic characteristic. The results of the conditional and random parameter logit model suggested that Korean consumers have the highest WTP for origin of all ingredients, followed by side-effect warnings, quality-related certifications, and date of import. It will be worthwhile to identify the value of relevant attributes once other nations establish FTS policies and improve food traceability services or regulations.