aspect of the services of experts (e.g., of doctors, lawyers, and accountants), and the role that voluntary pro bono work … might play. Expert services have un- verifiable quality to non-experts and are subject to moral hazard. Experts who cheat … their customers should crowd out experts who do not, resulting in low trust, prestige, and wages. We ask how pro bono work …

In credence goods markets, experts have better information about the appropriate quality of treatment than their … customers. Experts may exploit their informational advantage by defrauding customers. Market institutions have been shown … situation in which experts are heterogeneous in their diagnostic abilities. We find that efficient market outcomes are always …