Product survival analysis for the App Store

We empirically analyze both free and paid products on the top 100 Free and Grossing charts in the Korea App Store using Weibull parametric survival analysis on the product level. The findings are as follows: First, influences of ranking, customer ratings, and contents size on product survival are different for free and paid products. Customer ratings and contents size critically affect product survival when the price is zero. Second, the early entrant advantage exists in App Store, which results from a ranking system in the App Store and consumer learning. However, the effect of early entrant advantage differs between the Free and Grossing charts; the benefit of early entrant advantage is greater on the Free chart than that on the Grossing chart. Finally, we provide a competitive profit model that is related to free products.     

Do controlling shareholders' expropriation incentives imply a link between corporate governance and firm value? Theory and evidence

We develop and test a model that investigates how controlling shareholders' expropriation incentives affect firm values during crisis and subsequent recovery periods. Consistent with the prediction of our model, we find that, during the 1997 Asian financial crisis, Asian firms with weaker corporate governance experience a larger drop in their share values but, during the post-crisis recovery period, such firms experience a larger rebound in their share values. We also find consistent evidence for Latin American firms during the 2001 Argentine economic crisis. Our results support the view that controlling shareholders' expropriation incentives imply a link between corporate governance and firm value.     

Social exclusion influences on the effectiveness of altruistic versus egoistic appeals in charitable advertising

Marketing Letters - In three experiments, the authors study charitable behaviors and demonstrate that consumers who feel socially excluded react more positively to altruistic, other appeals rather...     

Young startup firm exports and productive efficiency

We employ the United States Census Bureau’s 2007 Survey of Business Owners to examine the relationship between the productive efficiency of startup firms and their level of exports. We find, consistent with previous work in the literature, that a small firm’s exports are positively related to their level of productive efficiency. This result holds after controlling for various individual owner, as well as firm, characteristics. Our results are also robust to the inclusion of a two-stage estimation strategy to control for the effects of endogeneity in the efficiency–exports relationship.     

International Involvement and Production Efficiency among Startup Firms

The economic theory of small firms often requires a reasoning process distinct from those typically used for large multinational enterprises (MNEs), since small firms typically do not possess the resources MNEs commonly employ to outperform similar domestic firms. In the current analysis, we argue that new small firms with international sales can better predict their revenue stream than can comparably aged firms with only domestic sales, and, as a result, international selling firms have higher levels of technical productive efficiency. We employ 7829 firm-year observations from the 2007 to 2011 years of the Kauffman Firm Survey microdata sample in our analysis. A stochastic frontier model empirically supports the result that technical productive efficiency is positively related to the foreign sales ratio. These results hold after controlling for multiple relevant owner and firm characteristics, as well as accounting for potential endogeneity concerns.     

A dynamic demand analysis of the United States air-passenger service

This study examines the short- and long-run effects of various determinants on the demand for US air passenger-services using the Johansen cointegration analysis and a vector error-correction (VEC) model. Results show that, in the long-run, airfare, disposable income and NASDAQ have significant effects on US air travel demand. The combined short-run dynamic effects of disposable income, NASDAQ, population and airfare jointly explain changes in air passenger-miles. Finally, we find that the 9/11 terrorist attacks drop air passenger demand by 5% during 2001:Q3-2002:Q2, which in turn pushes down the seat capacity by 4%. However, it has little impact on airfare.     

Medical costs in patients with heart failure after acute heart failure events: one-year follow-up study

Aims: This study investigated annual medical costs using real-world data focusing on acute heart failure.

Methods: The data were retrospectively collected from six tertiary hospitals in South Korea. Overall, 330 patients who were hospitalized for acute heart failure between January 2011 and July 2012 were selected. Data were collected on their follow-up medical visits for 1 year, including medical costs incurred toward treatment. Those who died within the observational period or who had no records of follow-up visits were excluded. Annual per patient medical costs were estimated according to the type of medical services, and factors contributing to the costs using Gamma Generalized Linear Models (GLM) with log link were analyzed.

Results: On average, total annual medical costs for each patient were USD 6,199 (±9,675), with hospitalization accounting for 95% of the total expenses. Hospitalization cost USD 5,904 (±9,666) per patient. Those who are re-admitted have 88.5% higher medical expenditure than those who have not been re-admitted in 1 year, and patients using intensive care units have 19.6% higher expenditure than those who do not. When the number of hospital days increased by 1?day, medical expenses increased by 6.7%.

Limitations: Outpatient drug costs were not included. There is a possibility that medical expenses for AHF may have been under-estimated.

Conclusion: It was found that hospitalization resulted in substantial costs for treatment of heart failure in South Korea, especially in patients with an acute heart failure event. Prevention strategies and appropriate management programs that would reduce both frequency of hospitalization and length of stay for patients with the underlying risk of heart failure are needed.     

Entrepreneurial overconfidence and firm survival: an analysis using the Kauffman firm survey

We used the Kauffman Firm Survey of ventures founded in the year 2004 to identify overconfident (OC) entrepreneurs and found, contrary to the existing literature, that the hazard ratio for these entrepreneurs was lower than the corresponding value for their non-OC peers. We categorized an entrepreneur as OC if he or she believed that his or her firm enjoys a competitive advantage over its industry peers, while simultaneously underperforming relative to the industry in terms of average initial ROA. Specifically, we looked at the average ROA during the years 2004–2007 and compared it to the industry median. In addition to our hazard findings, we discovered that these OC entrepreneurs, while starting with lower initial ROA levels relative to their industry peers, may have enjoyed slightly better movement in ROA over the intervening years. Our results are explained in the context of the psychological literature on optimism.