Hi
I modified Uwaza´s code ( http://www.otaru-uc.ac.jp/~uzawa/cal-economics/cournot-e3.pdf ) to work in the Mathematica 9. You can find it attached. I found this quite handy especially when visualizing equilibria with differing marginal costs.
Sincerely Severi
I don't believe there's anything built in specifically for that. I at least didn't see it when I looked.
You will want instead to model this using the Wolfram Language in Mathematica.
