Why is market data delayed?

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Tags

1. #market
2. #exchanges
3. #distribution
4. #about
5. #quotes
6. #original
7. #exchange
8. #stock
9. #usually
10. #charge
11. #delay
12. #theory
13. #provider
14. #license
15. #advantage
16. #behind
17. #minutes
18. #depending
19. #every
20. #traders
21. #floor