Abstract
This paper examines whether a firm will select an overoptimistic manager when a cost‐reduction investment has a spillover effect. We consider a Cournot competition model where R&D investment ex ante occurs before the process of product market competition. Our analysis reveals that there exists a unique and symmetric equilibrium for firms to delegate overoptimistic managers. We show that only when the spillover effect is sufficiently high do firms benefit from delegation. Furthermore, the equilibrium confidence level and investment decision first decrease and then increase as the spillover parameter changes. As the initial production cost increases, the equilibrium performance becomes worse.
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