Reliable design of a forward/reverse logistics network under uncertainty: A robust-M/M/c queuing model

This paper presents a novel model for designing a reliable network of facilities in closed-loop supply chain under uncertainty. For this purpose, a bi-objective mathematical programming formulation is developed which minimizes the total costs and the expected transportation costs after failures of facilities of a logistics network. To solve the model, a new hybrid solution methodology is introduced by combining robust optimization approach, queuing theory and fuzzy multi-objective programming. Computational experiments are provided for a number of test problems using a realistic network instance.     

Trade Intensity and Business Cycle Synchronicity in Africa

Abstract: Business cycle synchronicity, which is the key requirement for sharing a common currency, is not particularly strong within the prospective African monetary unions. However, this parameter is not irrevocably fixed and may be endogeneous vis‐à‐vis the integration process. For example, trade may increase the similarity of economic disturbances. This paper tests such an effect among the 53 African countries from 1965 to 2004. The estimated results suggest that trade intensity increases the synchronization of business cycles in the African context. The magnitude of the ‘endogeneity effect’ is, however, smaller than similar estimates among industrial countries.     

Flexible Contracts and Human Capital Investments

As suggested by human capital theory, workers with flexible contracts participate less often in training than those with permanent contracts. We find that this is merely due to the fact that flexworkers receive less employer-funded training, a gap they can only partly compensate for by their own training investments. Flexworkers particularly participate less in firm-specific training that is meant to keep up with new skill demands than workers with permanent contracts. However, for those who participate in employer-funded firm-specific training, a temporary contract appears to facilitate the transition to a permanent contract with the same employer. However, this does not hold for participation in self-paid training. This training, which is usually general training, does not help in finding a better job.     

Value for value—The dynamics of supplier value in collaborative new product development

Suppliers are recognized as an important source of innovation. Research into supplier involvement in new product development has shown that benefits can potentially be reaped by customers. However, a relatively unexplored precondition is the willingness of suppliers to invest in their customers’ innovative efforts. In this exploratory, theory-extending research, we investigate the value that a supplier can experience from being involved in high tech firms’ new product development. We find that value comes in three forms for suppliers: (1) financial payment for sales volumes and product development services, (2) technological knowledge and product designs, and the (3) reputation of doing business with leading-edge firms Additionally, we place this in a dynamic, long-term perspective, and find indications for a positive or negative feedback effect, depending on the emphasis the buyer puts on collaborative innovation with the supplier and the extent to which suppliers can use competences, knowledge and reputation resulting from the collaboration in subsequent business development activities. The positive effect results in added value for both parties in the dyad, and the negative effect leads to the opposite.