This study examines an aspect of competitive interactions that has att
racted increasing research attention: the relationship between deterre
nce and competitive reputations. We build a conceptual model of the an
tecedents and consequences of a firm's reputation for being a credible
defender of its markets. Theory and limited empirical evidence sugges
ts a firm with this reputation should deter competitive attacks agains
t it. We explore how a manager's competitive cognition about her oppon
ents' (1) patterns of activity in the marketplace and (2) previous suc
cess can lead her to perceive a competitor as a credible defender. We
test the framework using MBA students in a quasi-field setting, the Ma
rkstrat2 simulation game. The results of this study suggest that reput
ation deters attack only when the potential attacker considers the tar
get firm a minor competitor. Managers consider defenders that have pre
viously been successful as credible defenders of their markets. They a
lso weigh consistency of activity relative to industry average in maki
ng inferences about credibility. The study indicates that the deterren
ce-reputation link is more complex than previous theory and evidence m
ight imply, and suggests considerable promise for a psychological appr
oach to examining competitive interactions.