Recruiting agents, or "programs" costly screen “applicants” in matching processes, and congestion in a market increases … programs; however, they may harm match quality. In a multiple-elicitation experiment conducted in a real-life matching market …

The matching of likes is a frequently observed phenomenon. However, for such assortative matching to arise in a search … can generate even perfect assortative matching under weak conditions: supermodularity of the match production function is … ensuring that agents choose truthful signals. The information thereby transmitted allows agents to avoid all unnecessary costs …