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Public goods in networks 总被引:1,自引:0,他引:1
Yann Bramoullé 《Journal of Economic Theory》2007,135(1):478-494
This paper considers incentives to provide goods that are non-excludable along social or geographic links. We find, first, that networks can lead to specialization in public good provision. In every social network there is an equilibrium where some individuals contribute and others free ride. In many networks, this extreme is the only outcome. Second, specialization can benefit society as a whole. This outcome arises when contributors are linked, collectively, to many agents. Finally, a new link increases access to public goods, but reduces individual incentives to contribute. Hence, overall welfare can be higher when there are holes in a network. 相似文献
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Why are international financial institutions important? This article reassesses the role of the loans issued with the support of the League of Nations. These long‐term loans constituted the financial basis of the League's strategy to restore the productive basis of countries in central and eastern Europe in the aftermath of the First World War. In this article, it is argued that the League's loans accomplished the task for which they were conceived because they allowed countries in financial distress to access capital markets. The League adopted an innovative system of funds management and monitoring that ensured the compliance of borrowing countries with its programmes. Empirical evidence is provided to show that financial markets had a positive view of the League's role as an external, multilateral agent, solving the credibility problem of borrowing countries and allowing them to engage in economic and institutional reforms. This success was achieved despite the League's own lack of lending resources. It is also demonstrated that this multilateral solution performed better than the bilateral arrangements adopted by other governments in eastern Europe because of its lower borrowing and transaction costs. 相似文献
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Facing the growing number of digital natives entering the classroom, business professors look for innovative ways to enhance the student learning experience. The authors focus on the online interactive learning tool LearnSmart (McGraw-Hill, New York, NY), and examine its impact on student learning effectiveness by testing the direct and indirect relationships among perceived competence, perceived challenge, instructors, perceived value, and satisfaction with LearnSmart. Constructionism served as the theoretical foundation for this study. About 215 students at a public university in the United States took the survey and 197 valid responses were received. Regression analysis results showed that the use of LearnSmart improved students' perceived competency, thus increasing their perceived value of using LearnSmart, as well as their satisfaction with LearnSmart. Perceived value was also found to mediate the impact of perceived competency on satisfaction with LearnSmart, and the instructor played a significant role in facilitating and improving student learning. Perceived challenge impacted student's perceived value of using LearnSmart, but it did not influence satisfaction with LearnSmart. 相似文献
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This paper studies the dynamics of fundamental research. We develop a simple model where researchers allocate their effort between improving existing fields and inventing new ones. A key assumption is that scientists derive utility from recognition from other scientists. We show that the economy can be either in a regime where new fields are constantly invented, and then converges to a steady state, or in a cyclical regime where periods of innovation alternate with periods of exploitation. Our analysis provides a rigorous foundation to the Kuhnian theory of scientific evolution. We show that scientists' care for reputation has a strong impact on research dynamics and tends to favor innovation. Especially, innovation fads may emerge. We also study welfare and find that the academic reputational reward system can help align scientists' short-term incentives with society's long-term interests. 相似文献
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Yann Lombard-Platet 《广告导报》2008,(10)
中国人在互联网上休闲娱乐的同时也在找寻信息,对这一点,我一直深信不疑。人们对于发展和进步的渴望促使他们利用互联网来结交新朋友,并与之交流互动。这种追求进步的理念将最终决定互联网在中国的发展道路,并开发出更多新的网络应用,比如移动电话、数字电视等。 相似文献
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The present study uses Associative Network Theory to construct a model that explains effects of brand placement in movies. Based on a field experiment (n?=?167), we investigate the effects of plot connection and prominence on brand attitude, as well as the mediating role of brand-movie fit and the moderating role of brand familiarity. Results show that more closely connecting a brand to the plot of a movie positively impacts brand attitude by increasing the perceived fit between the brand and the movie. Brand familiarity moderates the effect of the interaction between a placement’s plot connection and prominence on brand attitude. When brand familiarity is high, there is no significant effect of plot connection on brand attitude, nor is this effect moderated by the prominence of the placement. However, when brand familiarity is low, both prominently and subtly connecting the brand to the plot of the movie positively influences brand attitude. More importantly, the effect of plot connection is significantly stronger when an unfamiliar brand is prominently placed, than when it is subtly placed. 相似文献
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Yann Braouezec 《Finance Research Letters》2009,6(1):13-22
In a simple symmetric information continuous-time model, we consider leverage as way to finance a fraction of the investment cost. We show that underinvestment cannot arise while overinvestment may and the room for overinvestment is negatively related with the fraction paid by equityholders. Finally, we show that our model predicts the (empirically observed) negative relation between the market-to-book ratio and the leverage ratio. 相似文献
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