"We investigate a firm's choice of formal and informal effort incentives in a repeated game setting with undistorted signaling and liquidity‐constrained agents. The model allows for a simple geometric representation of credibility and incentive‐feasibility effects on optimal contract design. If credibility constitutes a binding constraint, explicit, i.e. enforceable, performance pay and discretionary salary promises are unambiguous substitutes and higher employee performance is associated with lower‐powered bonus pay. Using personnel data from an insurance company, we show that the model's predictions regarding the mediating role of expected contract duration on these relationships are consistent with remuneration practices."

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