"When attorney effort is unobservable and certain other simplifying assumptions (such as risk neutrality) hold, it is efficient for an attorney to purchase the rights to a client's legal claim. However, the American Bar Association Model Rules of Professional Conduct prohibit this arrangement....

This paper provides a signaling model to analyze the equilibrium fee structures arising when attorneys are heterogeneous with regard to unobservable ability. Unlike fixed fees, contingent fees are more profitable to attorneys who have a greater probability of winning, and thus may serve as an...