Why does stock price drop after dividend?

Related questions

1. How often are dividends usually paid?
2. How do you buy stocks pre market?
3. Do you pay taxes on dividends if you reinvest them?
4. Is short selling legal?
5. What time does premarket open on Robinhood?
6. Can I trade premarket with Robinhood?
7. How are pre market prices determined?
8. Are Robinhood trades instant?
9. What time does premarket trading open?
10. Who can trade in premarket?

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2. #announces
3. #purchased
4. #effect
5. #premium
6. #purchase
7. #receive
8. #price
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10. #willing
11. #shares
12. #declaration
13. #dividend
14. #investors
15. #stock
16. #called