Before revision: We study matching policies in a dynamic exchange market with random compatibility, in which some agents are easier to match than others. In steady state this asymmetry creates an endogenous imbalance: hard-to-match agents wait for partners, while easy-to-match agents can match almost immediately upon arrival and leave the market quickly .
After revision: We study dynamic matching in exchange markets with easy- and hard-to-match agents wait for partners, while easy-to-match agents can match almost immediately upon arrival and leave the market quickly .