cooperation through two mechanisms: an entry mechanism, which leads to assortative selection of interaction partners, or an exit … that voluntary participation has a positive effect on public good provision through the exit mechanism, but we do not find … evidence of a positive effect of entry. Assortative selection of interaction partners seems to play a minor role in our setting …

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 …