Short answer questions: 21. What are two ways an incumbent can potentially deter entry by new competitors? Provide an example of each and explain how each action would deter entry. 22. Why did Aer Lingus respond so aggressively to Ryanair's entry? What was Ryanair's new strategy, and why was it more successful? How did JetBlue avoid aggressive retaliation when it entered? 23. Assess Walmart's launch of Sam's Club . Was Walmart's decision to diversify into warehouse clubs a good idea?