A pity that you propose the problem but not a solution. What would you propose to overcome the principal-agent problem in that regard? A tournament between diff

A pity that you propose the problem but not a solution. What would you propose to overcome the principal-agent problem in that regard? A tournament between different lawyers (proposed solution by wikipedia for prinipal-agent problem) doesn't really seem to work since it would only make sense after comparing the results of many transactions and of many lawyers.