What is the revenue model of trivago?

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Tags

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