Why does it take 3 days to settle a trade?

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Tags

1. #trade
2. #investors
3. #their
4. #means
5. #receive
6. #transactions
7. #executed
8. #settlement
9. #later
10. #shorthand
11. #three
12. #after
13. #security
14. #known
15. #brokerage
16. #business
17. #settle
18. #payment
19. #securities
20. #cycle