UNDERSTAND THE GLOBAL ECONOMIC CRISIS: A TEXT SUMMARIZATION APPROACH

Economic crises are significant threats to macroeconomic stability. They can incur large costs and bring devastating effects on economies, with the effects often spilling over into other economies. Since 2007 we have witnessed the most severe and widely spread economic crisis since the Great Depression of the 1930s. In the meantime, a huge amount of ongoing media coverage, reporting, analysis and debate concerning the global economic crisis has been generated. In this study we explore the possibilities of applying text summarization tools to learn from text documents the various discussions surrounding the global economic crisis. Included in our analysis are blog posts and articles of highly influential economists, as well as official speeches and publications of government organizations. The ICSI‐ILP extractive summarizer is applied in a large number of experiments, and the summary outputs are manually examined and evaluated. The results provide us with insights into the potential and limitations of state‐of‐the‐art summarization systems when used to help us quickly learn and digest large amounts of textual information. The results also suggest different ways to break the limitations of text summarization technology. Copyright © 2013 John Wiley & Sons, Ltd.     

Health Care Entrepreneurship in the Democratic Republic of the Congo: An Exploratory Study

In this empirical study, the authors explore entrepreneurship in the health care business in the Eastern Kasai Province of the Democratic Republic of the Congo (DRC) using cross-cultural literature and the resource-based view to ground its analyses. The data were collected using a questionnaire targeted toward the health care entrepreneurs in Mbuji Mayi, the capital city of the Eastern Kasai Province in July 2010, which yielded 68 responses. The results indicated that the entrepreneurs were predominantly middle-aged Congolese men with backgrounds in the health services field who had raised their startup capital mostly from personal savings or friends and family. Their businesses, which were mostly in the form of sole proprietorships, were likely to be located in areas underserved by public medical facilities and usually provided both curative and preventative medical services.     

Binary quantile regression: a Bayesian approach based on the asymmetric Laplace distribution

This paper develops a Bayesian method for quantile regression for dichotomous response data. The frequentist approach to this type of regression has proven problematic in both optimizing the objective function and making inferences on the parameters. By accepting additional distributional assumptions on the error terms, the Bayesian method proposed sets the problem in a parametric framework in which these problems are avoided. To test the applicability of the method, we ran two Monte Carlo experiments and applied it to Horowitz's (1993) often studied work‐trip mode choice dataset. Compared to previous estimates for the latter dataset, the method proposed leads to a different economic interpretation. Copyright © 2010 John Wiley & Sons, Ltd.     

Crises and structural change in Australian agriculture

We present a model of structural change in the farming sector in which natural and economic crises decrease farmers’ work satisfaction, farm profitability, and the decision to stay in farming. Using data from the Australian Regional Well-being survey, activity choice modeling, and a structural equation approach, we test the hypothesis that these crises-induced effects then cause structural change in Australian agriculture. We find that external shocks, such as drought or economic downturn, negatively affect farmers’ welfare, which in turn causes structural change through revised activity choices. Our empirical findings also indicate that specific adjustment strategies such as buying additional water titles or reducing input use are insufficient to mitigate adverse crises effects.     

STRATEGIC ADVERTISING AND DIRECTED SEARCH

Imperfect observability and costly informative advertising are introduced into a standard directed search framework. Capacity‐constrained sellers send costly advertisements to direct buyers' uncoordinated search by specifying their location and terms of trade. We show that the equilibrium advertising intensity is nonmonotonic in the buyer–seller ratio. In addition, we also find that price posting dominates auctions since both mechanisms yield the same expected revenue, but the latter results in higher advertising expense. Finally, we find a positive comovement between market transparency and price for low market tightness when the measure of informed buyers is endogenous.     

Royalties,entry, and spectrum allocation to the broadcasting industry

We characterize the socially optimal trajectory of spectrum royalty and firm entry in a deregulated over‐the‐air broadcasting industry. A social planner maximizes consumers' lifetime utility by setting royalties for the use of publicly owned spectrum. As the number of broadcasters adjusts to profits over time, the quality of service improves through greater variety but also deteriorates through intensified interferences. Contrary to observed consolidation and return to concentration in past deregulatory reforms, we find that optimal royalty control that accounts for these quality effects steers the socially optimal trajectory of royalties and firms to a more competitive steady state.     

The inescapable need for fractal tools in finance

Summary. This short paper advances and defends a strong statement concerning financial modeling. It argues that, even when the present fractal models become superseded, fractal tools are bound to remain central to finance. The reasons are that the main feature of price records is roughness and that the proper language of the theory of roughness in nature and culture is fractal geometry.This revised version was published online in January 2005 with corrections to the Cover date.     

Wages,Productivity and Aging

In this article, we estimate age-based wage and productivity differentials using Canadian linked employer-employee data from the Workplace and Employee Survey 1999–2005. We use data at the workplace level to estimate production functions, taking into account the age profile of its workforce. Data on workers is used to estimate wage equations that also depend on age. Results show concave age-wage and age-productivity profiles. On average, we find that wages do not deviate significantly from productivity. For certain sub-groups, our results suggest some discrepancies between wages and productivity. This is the case for older workers with at least an undergraduate degree for whom productivity appears to be lower than their wages, while the reverse seems true for younger men. However, even in those cases, productivity differentials are too imprecise to draw any firm conclusions.     

What (if any) are the returns to computer use?

Using North American data, we revisit the question first broached by Krueger (1993 Krueger, AB. 1993. How computers have changed the wage structure: evidence from microdata. Quarterly Journal of Economics, 108: 33–60. [Crossref], [Web of Science ®] , [Google Scholar]) and re-examined by DiNardo and Pischke (1997 DiNardo, JE and Pischke, J-S. 1997. The returns to computer use revisited: have pencils changed the wage structure too?. Quarterly Journal of Economics, 112: 291–303. [Crossref], [Web of Science ®] , [Google Scholar]) of whether there exists a real wage differential associated with computer use. Employing a mixed effects model with matched employer–employee data to correct for the fact that workers and workplaces that use computers are self-selected, we find that computer users enjoy an almost 4% wage premium over nonusers. Failure to correct for worker and workplace selection effect leads to a more than twofold overestimate of this premium.     

Spillover effects from unintended trials on attitude and behavior: Promoting new products through access-based services

Access-based services (ABS) provide an opportunity for brands to promote their new products by enabling (unintended) trials. However, the mechanisms and impact of consumer exposure to products in ABS and the subsequent potential spillover effects on both the brand and the product perception are largely unknown. Our hypotheses are derived from the information integration theory (IIT) and subsequently tested. Study 1 is a field study investigating an unintended trial moderated by involvement and positive experience. The results indicate the positive effects of the unintended trial on product and brand attitudes, brand purchase intention, and word of mouth. In line with IIT, these effects are more pronounced for positive trial experience, although in contrast to IIT, they are less pronounced for high-involvement consumers. While the results of Study 2, an online experiment, show substantial effects of both trials compared with nontrials, they also reveal that intended and unintended trials have a similar impact on attitude, but ABS experiences have a stronger positive impact on brand purchase intention. We thus recommend that brand managers promote not only new products but also their brands in unintended trials. This study fills a gap in current discussions about the trial effect(s) of ABS.