Which of the following conditions correctly describes a Nash equilibrium when two firms are in the market?
A. ?1(s1*, s2*) ? ?1(s1, s2*) for all s1.
B. ?1(s1, s2*) ? ?2(s1*, s2*) for all s1 and ?2(s1*, s2) ? ?1(s1*, s2*) for all s2.
C. ?1(s1*, s2*) ? ?1(s1, s2*) for all s1 and ?2(s1*, s2*) ? ?2(s1*, s2) for all s2.
D. ?1(s1*, s2*) ? ?2(s1, s2*) for all s1 and ?2(s1*, s2*) ? ?1(s1*, s2) for all s2.
Answer: C
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