Heard it a few times and it certainly seems like something that would happen but is there any proof or real world examples?
Can an Appraiser just make something worth $20m based purely on their say so?
EDIT: Thanks some great replies! and yeah i was asking more about the tax evasion part than the 'modern art is bad lol' angle.
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Some real formal talents that just got immediately turned into commodities. Like you're never going to really develop your practice when you're painting 16 colourway of Mickey Mouse or whatever because that's what your dealer decided your next show is going to be. Just brutal.