This is an Excel spreadsheet that solves for pure strategy and mixed strategy Nash equilibrium for 2×2 matrix games. (Note: If there are infinitely many equilibria in mixed strategies, it will not calculate them. Sorry!) The newest edition also calculates the minimum discount factor necessary to sustain cooperation in a grim trigger strategy equilibrium of an infinite prisoner’s dilemma. Enjoy!
I have included a couple of screenshots and video tour below:
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Edit: Someone asked for a Excel 2003 version of the calculator. I’m attaching it here. No guarantees that it functions properly.