  The extended Wild sums considered in this article generalize the classi- cal
Wild sums of statistical physics. We first show how to obtain explicit
solutions for the evolution equation of a large system where the interactions
are given by a single, but general, interacting kernel which involves m
components, for a fixed m >= 2. We then show how to retain the explicit
formulas for the case of OTC market models where the dynamics is more directly
described by two (or more) kernels.
