供应链速度与加速

分析了制造业企业供应链的时间消耗,根据时间消耗的特性分为价值增值时间和非价值增值时间;并试图给出一些加速供应链速度的方法。     

Beyond Time Discounting

The intertemporal tradeoffs made by most persons appear inconsistent when viewed through the lens of the standard time-discounting model. At different times and in different decision contexts, the same individual will often display behavior suggestive of a wide range of discount rates, from strongly positive (indicative of a lack of concern of future consequences) to strongly negative (implying greater concern for the future than the present). We argue that many of these apparent inconsistencies can be attributed to three aspects of time preference that are not part of the conventional model: decreasing impatience, a preference for sequences of outcomes that improve over time, and preference interactions between consumption and payments.     

Generalizations of the KPSS-test for stationarity

We propose automatic generalizations of the KPSS-test for the null hypothesis of stationarity of a univariate time series. We can use these tests for the null hypotheses of trend stationarity, level stationarity and zero mean stationarity. We introduce the asymptotic null distributions and we determine consistency against relevant nonstationary alternatives. We compare the properties of the tests with those of other proposed tests for stationarity. Monte Carlo simulations support the relevance of the tests when an autoregressive process with large positive autocorrelations is likely under the null hypothesis.     

The Impact of Choice Inconsistencies in Stated Choice Studies

A new test procedure revealing mutuallyinconsistent choices has been developed andapplied to Stated Choice data. Our analysisshows that inconsistent choices commonly occurin several Stated Choice tasks. An applicationof the test to the Norwegian Value of Timestudy data shows that failing to excludeinconsistent choices resulted in asubstantially higher Value of time. Theinconsistent choices were made by less educatedparticipants. As the tasks were undertaken inthe easy context of choosing travelalternatives with three attributes,practitioners of more complex and cognitivedemanding designs should be particularilyconcerned with these results.     

Revealing Preferences for Leisure Time from Stated Preference Data

When consumer choice is constrained by time as well as money, willingness to pay can be defined with respect to either numeraire. The two measures can be related formally within a utility-consistent model of choice subject to two constraints. Furthermore, when information is collected on both, the respondent's marginal value of time can be identified. A system of willingness to pay time and money and the marginal value of leisure time is estimated jointly in an application to California whalewatching and whale stock enhancement. The empirical approach can be applied with only minor additions to survey techniques for nonmarket valuation.     

商品房按揭贷款与资金的时间价值

本论述了商品房按揭贷款中，置业应正确认识贷款本金的偿还是按复利计算时间价值的，正确对待贷款购房中的“杠杆作用”。为置业在住房贷款中，代款数额、贷款方式、还款时间、还款方式的确定提出合理建议。     

论商品价值性质

不是任何抽象劳动都形成商品的价值,而是具有社会性、交换性和补偿性的抽象劳动才形成商品的价值。形成价值的抽象劳动的社会性、交换性和补偿性同时存在,三者互为前提,相互联系。抽象劳动的社会性、补偿性和交换性在生产过程和交换过程中形成商品价值性质。商品价值性质的核心是生产者的劳动时间与社会总劳动时间的关系。价值性质范畴有助于深化和发展劳动价值论,为判断劳动是否生产商品和形成价值提供新的视角。依据商品价值性质有助于解释一些经济现象,使劳动价值论更有说服力,从而增强其生命力。     

An Improved Inventory Coordination Model in a Multi-stage Multi-customer Supply Chain

To solve the inventory coordination model in a multi-stage, multi-customer supply chain, this paper first analyzes the third model （integer powers of two multipliers at each firm） studied by Moutaz Khouja （2003）, and the authors take a numerical example to prove that the third model is irrational to miss feasible solution. Then this paper puts up a new improved model （integer multiplier at each firm）, and takes the example to prove it gives better results than the integer powers of two multipliers at each firm.     

PORTFOLIO INSURANCE AND VOLATILITY REGIME SWITCHING

A new equilibrium model of portfolio insurance is presented in order to study the volatility effects of dynamic insurance strategies. While prior research has focused on the relationship between portfolio insurance and the overall level of market volatility, this article shows that the salient feature of portfolio insurance is volatility regime switching. Regime switching is shown to be a necessary condition for portfolio insurance, which provides a new explanation for the pervasive volatility clustering effect that is found in most equity markets. The equilibrium involves a free boundary and the local time of the equilibrium price process at the free boundary plays an important role in solving the model.     

A Note on EOQ Model for Items with Mixtures of Exponential Distribution Deterioration,Shortages and Time-varying Demand

An inventory model is considered in which inventory is depleted not only by demand, but also by deterioration. In this paper, we derive the EOQ model for inventory of items that deteriorates at a mixtures of exponential distributed rate, assuming the demand rate with a continuous function of time. Moreover, the proposed model cannot be solved directly in a closed form, thus we used the computer software IMSL MATH/LIBRARY (1989) to find the optimal reorder time Further, we also find that the optimal procedure is independent of the form of the demand rate. Finally, we also assume that the holding cost is a continuous, nonnegative and non-decreasing function of time in order to generalize EOQ model. Moreover, four numerical examples and sensitivity analyses are provided to assess the solution procedure.