How do metasearch engines make money?

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Tags

1. #travel
2. #income
3. #lower
4. #provides
5. #rates
6. #advertising
7. #company
8. #revenue
9. #attract
10. #advertisers
11. #potential
12. #because
13. #charge
14. #source
15. #using
16. #industry
17. #premium
18. #search
19. #visitors
20. #expenses
21. #number
22. #engines
23. #competing
24. #kayak
25. #level
26. #leads