Why does stock price change after hours?

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Tags

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2. #important
3. #trading
4. #volume
5. #shares
6. #effect
7. #market
8. #liquidity
9. #normal
10. #lower
11. #hours
12. #volatility
13. #markets
14. #after
15. #order
16. #limit
17. #usually
18. #price
19. #regular
20. #generally
21. #receiving