In online labor markets (OLMs), it is well known that platforms often enable bidders to list their skills to help employers assess their capability of completing a certain task. Given the wide range of projects in OLMs platforms, should bidders list more skills to match as many projects as...

This paper investigates a novel winner-determination mechanism: multiple-winner award rules that are widely used in e-procurement auctions and crowdsourcing sites. We focus on one unique award mechanism in e-procurement auctions, in which the auctioneer (i.e., the buyer) specifies three rules...