1. For how long had Costco exclusively accepted American Express cards?
2. Why do you think American Express' stock price fell 6.4% on news this agreement would not be renewed?
3. Does the fact that American Express' stock price fell on the news mean that American Express made a mistake when it did not agree to Costco's terms? Why or why not?
4. Why do you think few retailers have exclusive agreements with a single credit card company?