This paper estimates a dynamic, structural model of entry and exit in an oligopolistic industry and uses it to quantify …. Entry costs faced by potential entrants, fixed costs faced by incumbent producers, and the toughness of short-run price … the dentist industry allow the entry cost to differ for geographic markets that were designated as Health Professional …

may foster cooperation through an entry mechanism, which leads to assortative selection of interaction partners, or an … exit mechanism, whereby the opportunity to leave the partnership can be used as a threat against free-riders. We examine … on provision only through the exit mechanism. Assortative selection of interaction partners seems to play a minor role in …