“…The principal can choose to monitor the agent at a cost or set a payoff rule that brings both parties’ interests into line. In a one-time agreement, the principal fears that the agent will attempt to make less of an effort, a low-quality effort, or no effort at all for the same compensation; conversely, the agent fears the principal will pay less than the amount agreed to for the work done, or nothing at all (Fernández-Carro, 2007; Lapuente and Fernández-Carro, 2008). In a repeated agreement, both parties can benefit from the extended relationship, but this is known to be unstable.…”