Thinking Strategically by Avinash Dixit and Barry Nalebuff is a fantastic way to start. You can pick it up without any prior knowledge of game theory. I'd also

Thinking Strategically by Avinash Dixit and Barry Nalebuff is a fantastic way to start. You can pick it up without any prior knowledge of game theory. I'd also recommend Ken Binmore's Game Theory: A Very Short Introduction.