Why is discover not accepted everywhere?

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Tags

1. #exceed
2. #charge
3. #often
4. #american
5. #store
6. #amount
7. #profit
8. #spent
9. #retailers
10. #cards
11. #small
12. #accept
13. #express
14. #minimum
15. #transaction
16. #reason
17. #discover
18. #their
19. #owners
20. #require
21. #customer