Why are lithographs so expensive?

Related questions

1. What is the difference between a poster and a lithograph?
2. What does acid etch do to enamel?
3. What is window etching?
4. What does etch do to teeth?
5. What is the difference between a lithograph and a giclee?
6. Is original art a good investment?
7. What is tooth etching?
8. Do paintings appreciate in value?
9. What is Self Etch?
10. How do you make nital solution?

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19. #famous
20. #print
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22. #original
23. #lithograph
24. #value