This note shows that, for the combinatorial market goods defined by Wellman et al. (2001), there may not exist an optimal allocation that is in equilibrium. Moreover, this result holds even if the value of each processed job is independent of its completion time. The proposed algorithm for...

This paper addresses two important issues that may affect the operations efficiency in the recycling industry. First, the industry contains many small-scale and inefficient recycling firms, especially in developing countries. Second, the output from recycling a waste product often yields...

We consider the problem of scheduling a set of equal-processing-time jobs with arbitrary job sizes on a set of batch machines with different capacities. A job can only be assigned to a machine whose capacity is not smaller than the size of the job. Our goal is to minimize the schedule length...