Racehorse trainers operate asset management businesses in which the assets owned by outside clients compete with those owned by managers for the latter's time care and attention. Although this potentially leads to serious conflicts of interest we find no evidence of an agency problem: in a sample of 8000 racehorses and their associated stables client-owned horses perform no worse than trainer-owned horses on average. However this outcome is not uniform across stables: the average performance advantage of client-owned horses over their trainer-owned counterparts is positive in big stables where client-owners provide much of the trainer's income but is negative in small stables with relatively few outside clients. Agents with more to lose apparently behave better
