A Case for Percentage Commission Contracts : The Impact of a "Race" Among Agents

In standard principal-agent problems, the issue at hand is how to align the interests of the agent with those of her principal. A commonly used contract involves the principal paying the agent a percentage of the sale price as commission. With respect to real estate brokerage conracts, it has been argued that percentage commission contracts fail to provide sufficient incentives to the agent. This paper re-evaluates the standard solution to a one seller, one agent agency problem by introducing more than one agent. It is shown that percentage commission contracts can induce first-best effort levels from agents. The result is due to the negative externalities created by the winner-takes-all race among agents. The optimal commission rates in this model are inconsistent, however, with the observed uniformity in commission rates across markets in the U.S