*Subiza, B., J.M. Giménez-Gómez and J.E. Peris*

**Operations Research Letters – Forthcoming**

*Keywords*: Minimum cost spanning tree problem, Folk solution, Elementary cost matrix, Simple mcst problem

**Abstract:** A minimum cost spanning tree problem analyzes how to efficiently connect a group of individuals to a source. Once the efficient tree is obtained, the ad- dressed question is how to allocate the total cost among the involved agents. One prominent solution in allocating this minimum cost is the so-called Folk solution. Unfortunately, in general, the Folk solution is not easy to compute. We identify a class of mcst problems in which the Folk solution is obtained in an easy way. This class includes elementary cost mcst problems.