25


Figure 1. Best-response functions of firms (a = 50, b = 1, ω= 0.5 , β= 0.9)
outlasting the rival and capturing the entire market. But when a processor anticipates its rival
will invest heavily in quality assurance (and will become harder to outlast), the best the firm
can do is to reduce its own expenses and try to capture a higher per-period duopoly profit.
Comparing the stringency of assurance across the different types of reputation, Figure
1 reveals that, as expected, the equilibrium investments in QASs are lower when reputation is
a public good. When firms do not capture the full returns from their QASs, they will under-
invest in quality and try to free ride on other firms’ investments. Branding for example, could
be seen as an effort to convert reputations into a private good and hence capture a higher share
of the returns to investments in QASs.12 Economic theory predicts that if branding allows
processors to capture the returns to their investments, it will result in higher levels of quality
assurance. Also, though costlier QASs result in lower per-period outputs, the expected total
production (and hence consumption) is higher when reputation is a private good. This is driven
by the fact that more stringent controls result in a longer duopoly stage (in addition to any
output produced during the later monopoly periods).13
Results (not shown, but see footnote 13) indicate that monopoly total output levels are
higher than under duopoly when reputations are public in nature but not when reputations are
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