需求受价格和库存影响的非立即变质物库存模型

对于非立即变质类的物品,考虑它的需求率同时受价格和库存的影响,当库存大于一定量时,需求只受价值影响;小于一定量时,需求同时受价格和库存影响.在不允许缺货,且补充率为无穷的情况下,建立了单周期的库存模型,证明了其最优解的存在性,并给出了寻求最优库存策略和最优销售价格的方法.     

A General Method of Deriving the Inefficiencies of Banks from a Profit Function

This article develops a new method of estimating inefficiencies in joint production and shows that unlike the approaches utilized in the previous studies of inefficiency, this method maintains a consistent relationship between the error term of a profit function and the error terms of its price derivatives. A useful by-product of the method is a proof of a Hotelling-like lemma that relates stochastic input demand and output supply functions to stochastic profit functions. While the previous studies fit a single frontier to data on all firms, this paper estimates a frontier unique to every observed firm to allow each one to have a different potential of achieving maximal levels of profit. The new method is applied in the analysis of annual data, 1984–1989, for U.S. commercial banks. Both the analytical and numerical results of the paper show that the residual that the previous studies attribute to inefficiency includes the effects of excluded variables and of inaccuracies in the specified functional forms. Once accurate estimates of these effects are subtracted from the residual, the distortions in the measured inefficiencies should be considerably reduced. Consequently, this article considers how such estimates might be obtained.     

Price competitiveness of tourism packages to Australia: Beyond the “Big Mac” index

One issue facing any country or region concerns its price competitiveness as a package tour destination. One method of measuring this is to use what in other contexts has been referred to as the Big Mac approach. The “Big Mac” is a simple product with ingredients in fixed proportions, whereas the tourism product is a very complex one comprising different components depending on tourist expenditure patterns. There is no equivalent tourism product offered across countries, as the nature of the product is tailored to the origin market, expenditure levels and the length of the trip involved. The key issue is that of how to standardize the products being compared, so as to determine their relative price competitiveness. A method of constructing price competitiveness indexes, developed by the authors, can be applied to develop measures of the price competitiveness of different tour packages. This paper has three aims: To set down the essence of the preferred approach to measuring price competitiveness, noting its advantages and limitations; to employ this approach to construct price competitiveness indexes for package tours to Australia from Japan and the USA; and to indicate areas for farther research into the price competitiveness of package tourism worldwide.     

代理成本与经营管理者财务监督

委托代理关系存在三类形式,各类委托代理关系都存在相应的代理成本。本文从第三类代理成本的理论阐述入手,分析了经营管理者财务监督存在的客观必然性,探讨了第三类代理成本对经营管理者财务监督体制的影响,并按照降低第三类代理成本的要求,对构建经营管理者财务监督体制思路提出了设想。     

Economic evaluation of human urinary kallindinogenase for patients with acute ischemic stroke in China

Objectives: In China, both human urinary kallindinogenase (HUK) and 3-n-butylphthalide (NBP) are recommended for clinical use to improve cerebral blood circulation during an acute ischemic stroke (AIS). The objective was to evaluate the economic value of HUK vs NBP for patients with AIS from a Chinese payer’s perspective.

Methods: An economic evaluation based on data of patients who have been treated with either HUK (n?=?488) or NBP (n?=?885) from a prospective, phase IV, multi-center, clinical registry study (Chinese Acute Ischemic Stroke Treatment Outcome Registry, CASTOR) was conducted to analyze the cost and effectiveness of HUK vs NBP for AIS in China. Before the analysis, the patients were matched using propensity score. Both a cost-minimization analysis and a cost-effectiveness analysis were conducted to compare the matched pairs. A bootstrapping exercise was conducted for the matched arms to demonstrate the probability of one intervention being cost-effective over another for a given willingness-to-pay for an extra quality-adjusted life-year (QALY).

Results: After propensity score matching, 463 pairs were matched. The overall medical cost in the HUK arm is USD 2,701.20, while the NBP arm is USD 3,436.83, indicating HUK is preferred with cost-minimization analysis. Although the QALY gained in the HUK arm (0.77176) compared with the NBP arm (0.76831) is statistically insignificant (p?=?.4862), the cost-effectiveness analysis as exploratory analysis found that, compared with NBP, HUK is a cost-saving strategy with the lower costs of USD 735.63 and greater QALYs gained of 0.00345. Among the 5,000 bootstrapping replications, 100% indicates that HUK is cost-effective compared with NBP under a 1-time-GDP threshold; and 97.12% indicates the same under a 3-time-GDP threshold.

Conclusion: This economic evaluation study indicates that administrating HUK is a cost-saving therapy compared with NBP for managing blood flow during AIS in the Chinese setting.