Growth through entry--whether by offering new products in existing markets or offering the same products in new markets--doesn't happen in isolation. Multiple firms compete for these markets and so any discussion of growth through entry has to look at the impact of rivalry. In this module, you'll learn how to apply game theory to analyze, assess, and respond to competitors. With the payoff matrices tool, you'll be able to evaluate options and determine an effective position. The JetBlue vs. American Airlines case gives you an opportunity to apply this tool and deepen your understanding of how to identify potential rivals and determine an appropriate response.