排序方式: 共有15条查询结果,搜索用时 46 毫秒
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Bouhnik Sylvain Golany Boaz Passy Ury Hackman Steven T. Vlatsa Dimitra A. 《Journal of Productivity Analysis》2001,16(3):241-261
We propose an extension to the basic DEA models that guarantees that if an intensity is positive then it must be at least as large as a pre-defined lower bound. This requirement adds an integer programming constraint known within Operations Research as a Fixed-Charge (FC) type of constraint. Accordingly, we term the new model DEA_FC. The proposed model lies between the DEA models that allow units to be scaled arbitrarily low, and the Free Disposal Hull model that allows no scaling. We analyze 18 datasets from the literature to demonstrate that sufficiently low intensities—those for which the scaled Decision-Making Unit (DMU) has inputs and outputs that lie below the minimum values observed—are pervasive, and that the new model ensures fairer comparisons without sacrificing the required discriminating power. We explain why the low-intensity phenomenon exists. In sharp contrast to standard DEA models we demonstrate via examples that an inefficient DMU may play a pivotal role in determining the technology. We also propose a goal programming model that determines how deviations from the lower bounds affect efficiency, which we term the trade-off between the deviation gap and the efficiency gap. 相似文献
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We consider the following abstraction of competing publications. There are n players in the game. Each player i chooses a point xi in the interval [0,1], and a player's payoff is the distance from its point xi to the next larger point, or to 1 if xi is the largest. For this game, we give a complete characterization of the Nash equilibrium for the two-player game, and, more important, we give an efficient approximation algorithm to compute numerically the symmetric Nash equilibrium for the n-player game. The approximation is computed via a discrete version of the game. In both cases, we show that the (symmetric) equilibrium is unique. Our algorithmic approach to the n-player game is non-standard in that it does not involve solving a system of differential equations. We believe that our techniques can be useful in the analysis of other timing games. 相似文献
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Abstract: For small open economies, an understanding of movements in the exchange rate is imperative in analyzing trade and capital flows. In addition, reliable forecasting of exchange rate volatility is important in risk‐taking assessment and investment decision‐making, both of which are critical to long‐term growth. Using an asymmetric GARCH‐type approach, this paper examines the implications of economic liberalization on the stochastic behavior of the exchange rate series in a sample of sub‐Sahara African (SSA) countries over the 1970–2004 period. The results indicate that exchange rate volatility is variable, and is less volatile under fixed exchange rate regime (pre‐economic liberalization) and higher under flexible regime (post‐economic liberalization), that is, it is asymmetric. For most of the countries, the EGARCH and TGARCH models are robust to parameter stability and gives better forecasting performance compared to the standard GARCH model. 相似文献
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A Model of a Predatory State 总被引:2,自引:0,他引:2
We provide a model of a primitive state whose rulers extorttaxes for their own ends. This "predatory" state can resultin lower levels of both output and popular welfare than eitherorganized banditry or anarchy. The predatory state may providepublic goods, such as protection, and hence may superficiallyresemble a contractual state. But the ability to provide suchgoods can actually reduce popular welfare after allowing fortax changes. Moreover, the kinds of public goods that predatorystates provide are those that increase revenue, not necessarilywelfare. We consider when primitive states are likely to emergefrom organized banditry, and argue that poverty may result instatelessness rather than vice versa. We show that even a weakstate (in transition from banditry) can be bad for output andwelfare, and that a "corrupt" state that makes side deals withbandits is especially bad. 相似文献
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Does unrestricted control on the movement of capital increase capital mobility? Theoretically, the answer is yes. This paper uses the Feldstein–Horioka savings–investment methodology to examine the impact of financial openness on the degree of capital mobility in 104 countries. Our estimates suggest that financial openness has increased capital mobility in developing countries, while its effect is statistically insignificant in OECD countries. This also implies that a developing country with more financial openness can have more access to external capital markets for borrowings. Foreign aid also appears to supplement domestic savings for investment in developing countries. In line with the previous findings, our study also confirms that capital is more mobile for developing countries. 相似文献
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This paper describes a new frontier estimation procedure which relies on results obtained from Data Envelopment Analysis (DEA). The paper reviews some of the earlier works in this area and points out potential difficulties with them. It further suggests ways to validate such developments. A procedure is constructed on the basis of a Goal Programming (GP)-Discriminant Function model developed in stages during the 1980s. A numerical example is used to illustrate the proposed procedure. Then, an extensive simulation in which the GP-based procedure is compared to three regression-based techniques is presented. The simulation results clearly indicate the superiority of the proposed technique over the regression alternatives. 相似文献
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ABSTRACTSocial Impact Bonds (SIBs) offer an opportunity to explore the use of evidence to inform public policy and commissioning decisions in both discursive and practical terms in what are frequently highly politicized contexts. We identify three potential mechanisms by which SIBs may promote evidence use and explore these through empirical findings drawn from a three-year evaluation of SIBs applied to health and social care in the English NHS. 相似文献
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This article highlights 10 key strands of continuity and change in the use of evidence over the past two decades. Interest in evidence use continues, as do the many challenges encountered when seeking to deliver on this aspiration. There have been developments in ideas and actions, which foster some optimism that better use of varying forms of evidence can be encouraged. 相似文献
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This study examines implications of the current exchange rate regimes on the macroeconomic and growth performance of five Arab oil-producing countries: Saudi Arabia, the UAE, Sudan, Algeria and Yemen. The study evaluates alternative exchange rate regime policy options towards exploring an optimal exit strategy to ensure successful transition to more sustainable exchange rate regime, especially in the fixed regime economies of Saudi Arabia and the UAE. This study proposes the adoption of a transparent broad basket, band and crawl (BBC) regime by the Arab oil economies in order to provide a better alternative to the existing fixed pegs or dirty floats. However, it is imperative to note that, the timing of the exit from the current regime and the extent of institutional development and market sophistications are very critical to successful transition to more sustainable regime that would provide a larger scope for counter-cyclical policies and diversification in these economies. 相似文献