Score contribution per author:
α: calibrated so average coauthorship-adjusted count equals average raw count
Informal peer-to-peer services to share or barter goods often succumb to free riding behavior because they lack the tools to enforce compliance and reciprocity. We collect unique quantitative data on a form of unregulated peer-to-peer in-kind exchange that appears internationally viable: the free exchange of books via privately owned public bookcases, also known as little free libraries. Other than previously studied honor-based exchanges, little free libraries use a non-monetary one-to-one book exchange rate.