26
private. This illustrates that both firms and consumers can benefit when firms have large
incentives to protect their reputations.

- Reputation is a public good
—■— Reputation is a private good
• Monopoly
Figure 2. Equilibrium responses of the stringency of controls to changes in quality
observability (a = 50, b = 1, β= 0.9)
Figure 2 shows that as consumers can detect quality deviations more easily, the
equilibrium levels of stringency increase for all market structures and natures of reputation
considered.14 As discussed before, when quality is a credence attribute, firms will find it
optimal not to invest in QASs. Firms do not have incentives to avoid punishments that have
zero probability of occurrence. The level of stringency is always greater when reputation is a
private good. Furthermore, it reveals that the monopolist will provide the highest quality (in
expectations). It is straightforward to show analytically, for the proposed function
specifications, that monopolist will employ more stringent QASs and obtain higher profits than
duopolist with public reputations. Monopolists are the ones that will lose the most if a quality
deviation occurs and is detected.
Figure 3 shows that expected profits decline as consumers can more readily discern
quality. The reason is the increased cost of the optimal QAS and the increased probability that
a firm will lose its reputation. This (envelope) result is not sensitive to the particular
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