How does a short ETF work?

Related questions

1. Can you short an ETF?
2. What is a 3x leveraged ETF?
3. What is a cash settled option?
4. What companies are in Nasdaq?
5. What is the Tqqq?
6. What is a 2x leveraged ETF?
7. Is higher or lower leverage better?
8. Why are leveraged ETFs dangerous?
9. Can mutual funds use leverage?

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2. #produce
3. #proshares
4. #returns
5. #daily
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7. #derivatives
8. #nysemkt
9. #inverse
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13. #methods
14. #performance
15. #short
16. #other
17. #designed
18. #direction
19. #match