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1.
This paper gives a tree-based method for pricing American options in models where the stock price follows a general exponential Lévy process. A multinomial model for approximating the stock price process, which can be viewed as generalizing the binomial model of Cox, Ross, and Rubinstein (1979) for geometric Brownian motion, is developed. Under mild conditions, it is proved that the stock price process and the prices of American-type options on the stock, calculated from the multinomial model, converge to the corresponding prices under the continuous time Lévy process model. Explicit illustrations are given for the variance gamma model and the normal inverse Gaussian process when the option is an American put, but the procedure is applicable to a much wider class of derivatives including some path-dependent options. Our approach overcomes some practical difficulties that have previously been encountered when the Lévy process has infinite activity. 相似文献
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Wenbin Wang Aris A. Syntetos 《Transportation Research Part E: Logistics and Transportation Review》2011,47(6):1194-1209
Demand for spare parts is typically intermittent and forecasting the relevant requirements constitutes a very challenging exercise. Why is the demand for spare parts intermittent and how can we use models developed in maintenance research to forecast such demand? We attempt to answer these questions; we present a novel idea to forecast demand that relies upon the very sources of the demand generation process and we compare it with a well-known time-series method. We conclude that maintenance driven models are associated with a better performance under certain conditions. We also outline an inter-disciplinary agenda for further research in this area. 相似文献
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Solomon GL 《Medical economics》2000,77(11):31-2, 35
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Shadow economy and unemployment rate in USA: is there a structural relationship? An empirical analysis 总被引:1,自引:0,他引:1
This article aims to estimate the size of the US shadow economy (SE) using a structural equation approach and to evaluate if a structural relationship exists between the SE and the unemployment rate (UR) in the United States. The size of the SE is estimated to be decreasing over the last two decades. We corroborate the existence of a structural relationship between the SE and the UR by using a simple theoretical model. Furthermore, we extend the Okun's law to estimate the structural relationship between growth rate of official GDP, SE and UR. Our results indicate a significant positive relationship between the SE and the UR. 相似文献
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Solomon Barkin 《Journal of economic issues》2013,47(2):317-321
Public pension systems have long been a focus of special attention by neoclassical economics. In a context of intense aging processes, mainstream economists argue that the replacement of the pay-as-you-go pensions systems by unfunded individual savings accounts will have a positive impact, at a microeconomic and at a macroeconomic level, and will protect pension systems of the negative consequences of aging. However, these conclusions depend dramatically on the assumptions of rational expectations and perfect information. When we accept the existence of uncertainty, the presumed positive consequences of these reforms disappear, showing the advantages of pay-as-you-go over funded pension systems. 相似文献
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Why Democracies Cooperate More and Fight Less: The Relationship Between International Trade and Cooperation 总被引:1,自引:0,他引:1
Solomon W. Polachek 《Review of International Economics》1997,5(3):295-309
This paper provides an economics-based interpretation of the standard finding in the literature that democracies rarely fight each other. A general theory of conflict between two countries is presented and empirical analysis applies this theory to the question of why democracies rarely fight each other. The results show that the fundamental factor in causing bilateral cooperation is trade. Countries seek to protect wealth gained through international trade, therefore trading partners are less combative than nontrading nations. Democratic dyads trade more than nondemocratic dyads, and thus exhibit less conflict and more cooperation. 相似文献