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81.
In this paper we present a quantitative analysis of the evolution of some Internet and ICT evolution indicators. It focuses on the number of Internet hosts, the Internet penetration index, the ICT development index and the software/protocols development. In addition, we analyzed the series of most impacting events building up the Internet along the last fifty years. These analyses were carried out using the multi-logistic procedure recently proposed by the authors. Our results for hosts counting, penetration index and software/protocols development are compatible with the onset of some radical changes in the Internet technology to be currently underway and we forecast new growth rate peaks to occur by 2015. The software/protocols were found to having been powered by bursts of creativity with periods of the order of the Kuznets and Kondratiev economic cycles. Similar conclusions were drawn from the series of main events building up the Internet. Despite the clear signs of worldwide improvement in the ICT infrastructure and usage between 2002 and 2007 obtained from the ICT development index, its cross-correlation with the human development index (HDI) revealed the presence of a group of countries whose improvements in the operational ICT index are disconnected from their corresponding HDI improvements. 相似文献
82.
This note reinforces the results in a paper by Sen (International Journal of Industrial Organization, vol. 11, 1993, pp. 123–37). It is shown that his assumption that the incentive schemes in a two‐period model are the same for the two periods is not necessary for the results: only the long‐term nature of contracts with managers matters. 相似文献
83.
The existence of negative market timing, even for passive portfolios, poses a relevant puzzle when assessing portfolio management. In this paper, we develop a simple theoretical model so as to explain why such perverse market timing might occur and why those stocks with the lowest beta in upward markets exhibit pronounced negative timing. Our explanation is based on the existence of higher correlations of stocks in down markets than in up markets. We find that changes in beta, which drives timing, has four components; however, just two of these, mean covariance shift and covariances dispersion map, serve to explain the asymmetric behavior across stocks. We find that a high percentage of the negative market timing ability identified for mutual funds in the literature could be explained by this bias. 相似文献
84.
Competitiveness, resources, and capabilities: empirical evidence from retail banking 总被引:1,自引:1,他引:0
This research aims to identify and measure bank employee perceptions of the determinants of competitiveness in terms of resources,
skills, and capabilities within the retail banking sector. All the 40 branches of a leading Portuguese bank—the Caixa Geral de Depósitos—operating in two Portuguese districts were surveyed. Our results show that bank competitiveness differs according to performance
evaluation, human resource (HR) planning, the system of incentives, and managerial motivation. They also demonstrate that
human capital is a source of success in the business of banks, which relies heavily on stable and enduring relationships with
customers. The study also provides recommendations for retail bank managers seeking to refine their HR strategies as a means
of improving their competitiveness. 相似文献
85.
This paper proves the generic determinacy of Nash equilibrium in network-formation games: for a generic assignment of utilities to networks, the set of probability distributions on networks induced by Nash equilibria is finite. 相似文献
86.
This article introduces a data-driven Box–Pierce test for serial correlation. The proposed test is very attractive compared to the existing ones. In particular, implementation of this test is extremely simple for two reasons: first, the researcher does not need to specify the order of the autocorrelation tested, since the test automatically chooses this number; second, its asymptotic null distribution is chi-square with one degree of freedom, so there is no need of using a bootstrap procedure to estimate the critical values. In addition, the test is robust to the presence of conditional heteroskedasticity of unknown form. Finally, the proposed test presents higher power in simulations than the existing ones for models commonly employed in empirical finance. 相似文献
87.
Hansen and Christensen discuss a wide range of current issues regarding the role of emotions in consumer behavior as well as measures of advertising effectiveness. The central theme of the book is the elaboration and application of a new tool to measure the emotional constructions that consumers develop for branded fast moving consumer goods. The authors call this measure NERS, which stands for Net Emotional Response Strength. The book appeals to both intermediate and advanced academic readers due to the comprehensiveness of its literature review and the depth of its theoretical developments. The present essay critically comments the contents of the book and then, based on the context provided by the book, discusses in further detail some salient aspects of the role of emotions in consumer choice that deserve special attention. In particular, it is pointed out how some findings from behavioral decision research could improve the conceptualizations offered by Hansen and Christensen. 相似文献
88.
89.
The literature on mixed oligopoly shows that when production costs are quadratic the public firm is privatized if the competition in the product market is high enough. Similarly, when the public firm is less efficient than private firms and the marginal costs of production are constant, the government privatizes the public firm if its efficiency is low enough. In this paper we analyze this issue assuming that the public firm maximizes the weighted sum of consumer surplus, private profit and the profit of the public firm. If all firms have the same marginal cost of production we obtain that for some value of parameters the government does not privatize the public firm regardless of how many private firms are competing in the product market. We also obtain that the consumer surplus can be lower in the mixed oligopoly than in the private oligopoly. 相似文献
90.
This paper develops new methods for determining the cointegration rank in a nonstationary fractionally integrated system, extending univariate optimal methods for testing the degree of integration. We propose a simple Wald test based on the singular value decomposition of the unrestricted estimate of the long run multiplier matrix. When the “strength” of the cointegrating relationship is less than 1/2, the test statistic has a standard asymptotic distribution, like Lagrange Multiplier tests exploiting local properties. We consider the behavior of our test under estimation of short run parameters and local alternatives. We compare our procedure with other cointegration tests based on different principles and find that the new method has better properties in a range of situations by using information on the alternative obtained through a preliminary estimate of the cointegration strength. 相似文献