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41.
Aki-Hiro Sato Takaki Hayashi Janusz A. Ho?yst 《Journal of Economic Interaction and Coordination》2012,7(2):167-179
We investigate quotation and transaction activities in the foreign exchange market for every week during the period of June 2007 to December 2010. A scaling relationship between the mean values of number of quotations (or number of transactions) for various currency pairs and the corresponding standard deviations holds for a majority of the weeks. However, the scaling breaks in some time intervals, which is related to the emergence of market shocks. There is a monotonous relationship between values of scaling indices and global averages of currency pair cross-correlations when both quantities are observed for various window lengths ?? t. 相似文献
42.
A financial institution that adopts an advanced measurement approach (AMA) as a method of computing operational risk capital has to measure 99.9 % value-at-risk (VaR) as the amount of an operational risk. The most popular method to satisfy the AMA standards requires the evaluation of aggregate (compound) loss distribution, which is called the loss distribution approach (LDA). The Monte Carlo (MC) method is a well known method for calculating VaR under the LDA. However, when using the MC method to calculate VaR, the statistical error of VaR for the fat-tailed distribution increases and the computation time increases in proportion to the expected value of frequency distribution. Since the MC method has these problems, this paper presents a new methodology to compute VaR under the LDA using fast wavelet expansion techniques. The key features of our algorithm are follows: (1) Scale transformation technique for loss distributions, (2) Double exponential transformation for oscillatory integrals, (3) Finite series expansion of the wavelet scaling coefficients, (4) Wynn’s epsilon algorithm to accelerate the convergence of those series, (5) Efficient cubic spline interpolation method to calculate the moment generating function. We illustrate the effectiveness of our algorithms through numerical examples. 相似文献
43.
44.
Meg Adachi‐Sato 《The Canadian journal of economics》2018,51(1):275-313
This article considers the effect of vesting conditions of stock‐based compensation on firms’ decisions to replace managers. I indicate that firms may excessively replace managers with both long‐ and short‐term vested stock‐based compensation, while excessive retention can be caused only by short‐term vested options. If the discount factor is sufficiently small, I also show that short‐term vested stock‐based compensation is the equilibrium contract. The study also has implications for regulations concerning mandatory deferral and clawback of executive pay. 相似文献
45.
A difference/system generalized method of moments (GMM) model that imposes time-constant coefficients is common in empirical studies using panel data. However, a rejection by the Sargan–Hansen test is sometimes a serious concern for researchers. We highlight the fact that the Sargan–Hansen test for GMM estimators applied to panel data is a joint test of valid orthogonality conditions and coefficient stability over time. A possible reason for a rejection is therefore that the slope coefficients vary over time. One solution is to estimate an empirical model in which the coefficients are time specific. We apply this solution to the system GMM estimator of simple nondynamic Cobb–Douglas production functions for a selection of Swedish industries and find that relaxing the assumption of constant slope coefficients results in more satisfactory outcomes of the Sargan–Hansen test. 相似文献
46.
TAKASHI Sato 《The Japanese Economic Review》1996,47(4):412-420
This paper deals;with a situation where a quality-setting Cournot firm and a price-seeting Bertrand firm coexist in the same industry. Under a set of regularity conditions on demand and coast, we compute equilibrium prices on Cournot-Bertrand "mixed"duopolies, and compare them with those of "pure" Cournot and Bertrand duopolies. 相似文献
47.
养老保险改革对家庭储蓄率的影响:中国的经验证据 总被引:20,自引:1,他引:19
本文利用1995年和1999年城镇住户调查数据(CHIPS)分析中国养老保险制度改革对家庭储蓄率的影响,从一个新的角度解释20世纪90年代中后期中国家庭储蓄率上升的原因。1995—1997年间中国对城镇企业职工进行的养老保险制度改革使得企业职工养老金财富发生变化,这种养老金财富的变化具有外生性,因而这项改革可以作为一项政策实验用来识别养老金财富对家庭储蓄率的影响。研究结果表明:中国的储蓄行为可以由生命周期模型解释;养老金财富对于家庭储蓄存在显著的替代效应,这一效应平均为-0.4—-0.3左右;但不同家庭这种替代效应有明显差异,户主年龄在35—49岁的家庭,储蓄率会显著受到养老金财富的影响,其他家庭这一影响并不显著。 相似文献
48.
Robin Boadway Maurice Marchand Motohiro Sato 《The Scandinavian journal of economics》1998,100(3):545-564
The literatures on differential commodity taxes and on quantity controls to supplement income taxation have developed separately. This paper combines these two strands in the standard framework of optimal non-linear income taxation. We use a model with two types of households where the government has access to both subsidy policy and public provision of a good substitutable for leisure, and ouseholds can supplement the publicity provided good from the market. We present conditions under which policy should involve one or both of these two instruments alongside income taxation. The model is extended to many ability types. 相似文献
49.
In this paper, we introduce a new assumption concerning the (non)satiation property of preferences and establish the existence of a competitive equilibrium under it. The assumption is weaker than the standard nonsatiation assumption and “weak nonsatiation” introduced by Allouch and Le Van (2008). In particular, it allows preferences to be satiated only inside the set of individually rational feasible consumptions, while the two nonsatiation assumptions do not. It is also worth noting that just like the two nonsatiation assumptions, our new assumption depends solely on the characteristics of consumers. 相似文献
50.
This article argues that the futures of health systems depend on how countries address three wider challenges that include: (a) the adoption of health innovations and quality improvements, (b) responses to new non-communicable and preventable global diseases, as well as (c) adjusting financial models to current insurance constraints. Future trends point towards an increasing dependence on productive quality improvements, the personalisation of health care and the organisation of delivery and finance to take advantage of existing knowledge. Prevention, and disease avoidance, particularly that of non-communicable diseases, will aim to reduce pressure on “care components” of the health system whilst global control of communicable risks will become apparent. Finally, trends suggest an increase in patient participation and personalisation of insurance contracts will help to realign risk sharing with cost containment and financial sustainability. Other potential challenges such as ageing are regarded as second order issues to be addressed through these aforementioned future trends. 相似文献