1,720,965 research outputs found
Non-linear pricing and conscious consumption
Get PDFWe consider a duopolistic market in which a green firm competes with a brown rival and each firm sells two quality-differentiated products. We study optimal non-linear contracts offered by the two firms when consumers: (i) Are privately informed about their willingness to pay for quality, and (ii) differ in their environmental consciousness. We characterize how consumers with different valuations for quality self-select into firms and show that the ranking of qualities, relative prices and profits all depend on the interplay between consumers’ valuations and firms’ cost heterogeneity. Interestingly, when consumers’ valuations for quality are relatively low, the brown firm does not offer a low-quality variety. This contrasts with the situation of full information, in which both firms commercialize a high- and a low-quality variety. Hence, the lack of information about consumers’ valuations may not only favor the green firm in terms of higher prices and profits, but also reduce the product range offered by the brown rival
Coalition formation games with separable preferences
No full textWe provide sufficient conditions for the existence of stable coalitional structures in a purely hedonic game, that is in a coalition formation game such that players' preferences over coalitions are completely determined by the members of the coalition to which they belong. First, we show that the existence of core stable and Nash stable solutions for the game depends on certain vector decompositions of the utility functions representing additively separable and symmetric preferences. Then, we generalize the results obtained and show that equilibria with the same qualitative features exist under much weaker restrictions on agents' preferences. Finally, we examine the relationships between the properties we introduce and other conditions, already known in the literature, that guarantee the existence of stable partitions. © 2002 Elsevier Science B.V. All rights reserved
No mission? No motivation. On hospitals' organizational form and charity care provision
Get PDFA healthcare provider faces two decision problems. On the one hand, it chooses its organizational form: a hospital can be a for-profit institution providing compensated care only, or it can be a nonprofit organization whose mission is enhancing access to care for uninsured, low-income patients. On the other hand, the provider chooses which health professionals to hire, without observing their heterogeneous skills and their pro-social motivation. These decisions are related because an increase in the percentage of revenues, that the nonprofit hospital sacrifices for charity care, might enhance the motivation of its workers and induce some of them to donate their labor, that is, to volunteer. Accordingly, this article analyzes the provider's optimal screening contracts, which are contingent on workers' ability and satisfy limited liability, and relates them to the optimal choice of its mission-orientation. The results provide a new rationale for: (Formula presented.) the emergence of different organizational forms for hospitals, such as for-profits and nonprofits, which complement public hospitals in the provision of health care, (Formula presented.) the heterogeneity in the degree of charity care chosen by different nonprofit hospitals
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Single-mode regime of square-lattice photonic crystal fibers
No full textThe modal cutoff of square-lattice photonic crystal fibers with a finite number of air-hole rings has been accurately investigated to our knowledge for the first time. By analyzing the leaky behavior of the second-order mode, we have obtained a phase diagram that describes the regions of single-mode and multimode operation as well as the endlessly single-mode regime. Furthermore, starting from these results, we have obtained the cut-off normalized frequency according to two different formulations of the V parameter previously adopted for fibers with a triangular lattice. A final comparison of the cutoff properties of fibers characterized by a square lattice and a triangular lattice has been carried out. © 2005 Optical Society of America
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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