How do art galleries make money?

Related questions

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2. What are the benefits of museum?
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4. Is the San Diego Museum of Art free?
5. Are museums in Balboa Park free?
6. How many museums are on Museum Island Berlin?
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8. What are museums used for?
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Tags

1. #small
2. #costs
3. #somewhere
4. #display
5. #rarely
6. #pieces
7. #every
8. #payment
9. #commission
10. #different
11. #around
12. #gallery
13. #monthly
14. #percentage
15. #galleries
16. #exchange