buy (sell) a single unit of an indivisible good. The core predicts a unique and extreme outcome: the entire surplus is … split evenly among the buyers when m gt; n and among the sellers when m lt; n; the long side gets nothing. We test this core … deviations from the core prediction, we find that successful collusion is infrequent in both new institutions. A disproportionate …

. The core predicts a unique and extreme outcome: the entire surplus is split evenly among the buyers when m > n and among … the sellers when m < n; the long side gets nothing. We test this core conjecture in the lab with n + m = 3 or 5 randomly … agreements while trading. Despite frequent attempts to collude and occasional large deviations from the core prediction, we find …

A longstanding criticism of the core is that it is too sensitive to small changes in player numbers, as in a well known … and decreasing over time even with institutions that facilitate collusion and, consistent with core theory, a …

core and whether efficient matching is assortative determine the rate of matching, efficient matching, and surplus achieved …We conduct one of the first laboratory experiments and noncooperative analyses of the de-centralized matching market … but some differ from experimental evidence. Stable matching, which coincides with efficient matching in this setting, is …