Production planning of a hybrid manufacturing-remanufacturing system under uncertainty within a closed-loop supply chain

This paper deals with the production planning and control of a single product involving combined manufacturing and remanufacturing operations within a closed-loop reverse logistics network with machines subject to random failures and repairs. While consumers traditionally dispose of products at the end of their life cycle, recovery of the used products may be economically more attractive than disposal, while remanufacturing of the products also pursues sustainable development goals. Three types of inventories are involved in this network. The manufactured and remanufactured items are stored in the first and second inventories. The returned products are collected in the third inventory and then remanufactured or disposed of. The objective of this research is to propose a manufacturing/remanufacturing policy that would minimize the sum of the holding and backlog costs for manufacturing and remanufacturing products. The decision variables are the production rates of the manufacturing and the remanufacturing machines. The optimality conditions are developed using the optimal control theory based on stochastic dynamic programming. A computational algorithm, based on numerical methods, is used for solving the optimal control problem. Finally, a numerical example and a sensitivity analysis are presented to illustrate the usefulness of the proposed approach. The structure of the optimal control policy is discussed depending on the value of costs and parameters and extensions to more complex reverse logistics networks are discussed.     

Modeling Distribution Channel Dynamics of North American Cars in the Spanish Automobile Industry

Relations between manufacturers and distributors have been the center point of the distribution channel’s management. This study covers the effects of coercive, as well as non-coercive power on intermediary variables such as cooperation and conflict. It will also analyze the effects of cooperation and conflict on American car dealers’ satisfaction and performance in Spain. Due to the small sample size (46 dealers), the model based on causal modeling compelled us to use the optimization method based on the partial least squares (PLS) regression techniques coupled with a bootstrapping to enable some generalization of the results.

Competitivity of the Automobile Industry: The French Way

The French auto industry is now one of the most successful in the world and has developed markets in other European countries and further afield. The intriguing background to this has been that the French manufacturers, Renault and PSA, have developed strategies based largely upon homegrown employment cultures. While the companies have spent considerable time in Japan, the specificity of French employment practices and employee relations have intervened to block or significantly moderate outside practices. Perhaps the most important lesson is that any organizational system cannot be separated from its social, historical and economic context, in which the interests of different actors impact upon the process of innovation.     

Intergenerational Altruism and the Environment

We construct an overlapping generations model of pollution externality in which individuals are altruistically linked to their offspring as in Barro (1974). It is shown that steady-state consumption may be a decreasing function of the intergenerational degree of altruism. Despite individuals' altruism, the competitive equilibrium is not optimal. We thus study the social optimum and show that it can be decentralized.
JEL classification: D 62; D 64; D 91     

“差语法”与价值工程

本文介绍了一种技术创新的方法:即“差语法”.这种方法不仅源于价值工程(VE),且是在创新方法上的拓展与延伸.“差语法”与VE的有关著作所推荐的各种创新技法相比,更具有操作的连续及可行性;加之其依据充分,符合创造机理,因此容易获得成功.     

On the consequences of state dependent preferences for the pricing of financial assets

This paper introduces state dependent utility into the standard Mehra and Prescott [J. Monet. Econ. 15 (1985) 145] economy by allowing the representative agent's coefficient of relative risk aversion to vary with the underlying economy's growth rate. Existence of equilibrium is proved and its asymptotic properties analyzed. This generalization leads to level dependent marginal rates of substitution, a property that sharply distinguishes this model from the standard construct. For very low coefficients of relative risk aversion, the equilibrium risk free and risky security returns are demonstrated to have volatilities and an associated equity premium that substantially exceed what is found in the data. This provides a contrasting perspective on the classic “equity premium puzzle.”     

Public pensions and growth

This paper investigates the relationship between the size of an unfunded public pension system and economic growth in an overlapping generation economy, in which altruistic parents finance the education of their children and leave bequests. Unlike the existing literature, we model intergenerational altruism by assuming that children's income during adulthood is an argument of parental utility. Unfunded public pensions can promote growth when families face liquidity constraints preventing them from investing optimally in the education of their children. We consider two alternative ways of financing a public pension system, either by levying social contributions in a lump-sum manner or in proportion to labour income. We find that there is no case for unfunded public pensions in economies where bequests are operative. By contrast, there exists a growth-maximising size of the public pension system in economies where bequests are not operative and individuals are sufficiently patient.     

Basic education and income inequality in Brazil

This paper attempts to elucidate the long-term impact of basic education on income inequality in Brazil. It does so, first, by examining how investment in basic education affects incomes and, second, by assessing the extent to which government involvement in the financing of education services and the taxing of the returns of education investment contributes to the achievement of a more equitable distribution of income.On the basis of the empirical evidence available in Brazil, it is possible to suggest that: (i) education per se cannot significantly reduce inequality, (ii) government policies in terms of education subsidies and taxes on lifetime earnings do not show a clear redistribution pattern, and (iii) there exist effective policy tools in the area of employment, education wastage, cost recovery practices which could help bridge the gap between rates of return to education and reduce income inequality.