How does Trivago make profit?

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Tags

1. #booking
2. #revenue
3. #first
4. #hotel
5. #called
6. #whereby
7. #listed
8. #selecting
9. #deals
10. #basis
11. #users
12. #trivago
13. #revenues
14. #charged
15. #referral
16. #earns
17. #clicks
18. #commissions
19. #hotels
20. #based
21. #click
22. #sites
23. #which