Competition in the Korean Internet Portal Market: Network Effects, Profit, and Market Efficiency

Internet portals serve as platforms for coordinating advertisements, content, and user markets. We model portal structure with South Korean market data to explain network effects and other competition factors. We also analyze network effects on profit and market efficiency. The results indicate a negative network effect from banner advertisements in the user market, which is countered by a network effect from content provision. In the advertising market, the network effect from user demand is positively identified, which explains profit making through increased user visits. Furthermore, we show that network effects due to market concentration result in increases in consumer surplus.     

Congruence Effects in Post-crisis CSR Communication: The Mediating Role of Attribution of Corporate Motives

Corporate social responsibility (CSR) has grown on the corporate agenda and is at the heart of today’s corporate culture. While much research has examined CSR strategies and effects, the effects of post-crisis CSR communication have received relatively little academic attention. Therefore, this paper uses two experimental studies to examine several key contingency factors that influence consumers’ responses to post-crisis CSR initiatives. Results suggest that consumers demonstrate more favorable responses when a company launches a CSR initiative congruent with the crisis issue, or when the crisis is the result of an accident rather than a transgression. Further, the congruence between the crisis issue and the pre-crisis CSR initiative moderates the consistency effects between pre- and post-crisis initiatives. Such findings should be understood by considering the mediating role of corporate CSR motives’ consumer attributions, which was evidenced in this study. This study theoretically contributes to an improved understanding of the underlying mechanism of the post-crisis CSR information process and managerially contributes to the strategic development of effective post-crisis CSR initiatives given a particular situation.     

Estimating emissions based on the integration of microscopic traffic simulation and vehicle dynamics model

This study proposes an integrated simulation approach, which consists of a microscopic traffic simulation model, a vehicle dynamics model, and an emission estimation model, in order to estimate emissions based on more reliable vehicle performance measures. The vehicle performance measures such as engine power and engine speed significantly relate to the amount of emissions, and road curvatures and inclinations are the core inputs affecting these vehicle performance measures. Therefore, providing reliable vehicle performance measures reflecting the road geometric attributes is critical for a reliable emission estimation. This study proposes to use the microscopic traffic simulation model for generating vehicle trajectories, which is advantageous in modeling various traffic situations, and the vehicle dynamics model for producing the vehicle performance measures based on the vehicle trajectories. Finally, the outputs from the vehicle dynamics model are fed into the emission estimation model to compute emission measures. This study conducted a case-study using two road sections, one is a hypothesized road section, including various curvatures and inclinations with regular variations, and the other is a Kesselberg road section, which is an actual geometry in Bayern, Germany. The emission measures are estimated in these case-study road sections using both an existing simulation approach and the proposed integrated simulation approach. The difference between these two emission estimation approaches is discussed in terms of the emission measures, including fuel consumption, nitrogen oxides, and particulate matters.     

Dress for success: the effect of exhibitors’ dress conformity and self-construal on attendees’ approach behavior

ABSTRACT

The purpose of the current study is to investigate how attendees’ approach behavior is influenced by exhibitors’ dress conformity. A 2 × 2 between-subjects quasi-experimental design was utilized for this study. Our results showed that conforming dress for exhibitors can lead to a higher level of approach behavior of trade show attendees as compared with nonconforming dress, and the effect of exhibitors’ dress styles on approach behavior is moderated by attendees’ self-construal. Findings of this study provide significant insights for trade show exhibitors and attendees.     

Corroborating social media echelon in cancer research

Worldwide medical facilities differ, and for this reason, the causes of death can vary. Cancer is considered the second leading cause of death after heart disease worldwide, and the same causes of death are observed in the United States (US). Therefore, the purposes of this study are to explore worldwide research levels in the field of cancer and the social collaboration of researchers and institutions in this field. This article examines the structural patterns of international co-authors and co-institutions in science citation index papers in cancer research. The study uses measures from the social network analysis method, including degree centrality, betweenness centrality, eigenvector centrality, and effectiveness, to investigate the effects of social networks in the area of cancer research. Empirical analysis results identify the US is the most central country, followed by Germany, Italy, France, and China, in terms of co-authored networks in this research field. Institutional analysis results indicate that the University of Milan is at the top in terms of degree centrality. The Gustave Roussy Cancer Campus in France and German University of Düsseldorf occupy the second and fourth positions, respectively. The University of California in Los Angeles and Harvard University, both in the US, are at third and fifth positions, respectively.     

Hyperbolic normal stochastic volatility model

For option pricing models and heavy-tailed distributions, this study proposes a continuous-time stochastic volatility model based on an arithmetic Brownian motion: a one-parameter extension of the normal stochastic alpha-beta-rho (SABR) model. Using two generalized Bougerol's identities in the literature, the study shows that our model has a closed-form Monte Carlo simulation scheme and that the transition probability for one special case follows Johnson's distribution—a popular heavy-tailed distribution originally proposed without stochastic process. It is argued that the distribution serves as an analytically superior alternative to the normal SABR model because the two distributions are empirically similar.     

Demand for fair value accounting: The case of the asset revaluation boom in Korea during the global financial crisis

When the fair value accounting (FVA) option for property, plant, and equipment was introduced in the midst of the global financial crisis, a significant proportion of Korean firms elected FVA. We attribute this unusual boom in asset revaluations to the nation's culture of government intervention and civilian compliance, which was particularly espoused during this period of financial turmoil, and a foreseeable option to switch back to historical cost accounting. We find that among those firms whose debt‐to‐equity ratios are low, public firms opt for the FVA option more often than private firms, suggesting that the need to communicate fair value information with diversified equity holders is more important than the need to do so with creditors. In contrast, among those firms whose debt‐to‐equity ratios are high enough to warrant such unfavorable dispositions as new debt freezes and monitoring by regulators, we find no difference in the FVA choice between private and public firms. These findings imply that during the global financial crisis, private firms that rely heavily on debt financing have a strong incentive to utilize FVA to comply with government guidelines for the debt‐to‐equity ratio and to ease a potential hold‐up problem by influential creditors.     

Are social entrepreneurs more risk-averse?

We have a conventional wisdom that risk-seeking behaviours are related to commercially oriented entrepreneurs. For this reason, most studies have focused on the context of commercial entrepreneurship, and thus we do not know the risk propensity of social entrepreneurs. Using the PSM method, contrary to our wisdom, we find that social entrepreneurs tend to more have about 15% risk-seeking propensity than commercial entrepreneurs.     

Weak‐instrument robust inference for two‐sample instrumental variables regression

Instrumental variable (IV) methods for regression are well established. More recently, methods have been developed for statistical inference when the instruments are weakly correlated with the endogenous regressor, so that estimators are biased and no longer asymptotically normally distributed. This paper extends such inference to the case where two separate samples are used to implement instrumental variables estimation. We also relax the restrictive assumptions of homoskedastic error structure and equal moments of exogenous covariates across two samples commonly employed in the two‐sample IV literature for strong IV inference. Monte Carlo experiments show good size properties of the proposed tests regardless of the strength of the instruments. We apply the proposed methods to two seminal empirical studies that adopt the two‐sample IV framework.     

Bertrand versus Cournot competition in a downstream mixed oligopoly with foreign ownership

Focusing on foreign ownership in the private firm, we examine the Cournot-Bertrand comparison in a mixed oligopolistic market with vertical market structure. We have found that if public and private firms were charged with uniform price for their inputs, then Cournot-Bertrand ranking in market outcomes confirms those obtained by Ghosh and Mitra (2010). This implies that under uniform pricing in the upstream sector, the vertical market structure does not have substantial influences on Cournot-Bertrand ranking. However, if discriminatory pricing is adopted, firm's profits, output, and social welfare are often reversed to those obtained from uniform pricing in the upstream sector. Given the closeness of products, if the share of foreign ownership is sufficiently low, social welfare in Cournot competition can exceed that of Bertrand competition, contrasting with the standard welfare ranking that Bertrand welfare is strictly higher than Cournot. This implies that Cournot competition can be more socially desirable than Bertrand in mixed oligopoly with vertical market structure if discriminatory pricing scheme is adopted by foreign upstream monopolists.