In 2018 street artist Banksy’s piece Girl With Balloon sold at auction for $1. 4 million. Within moments the piece started to shred itself. The buyer agreed to continue with the purchase and Banksy retitled the work Love Is in the Bin. On social media Banksy showed how he had put the shredder into the frame in case the piece ever went to auction. Between 2018 and 2021 Banksy, whose identity is anonymous, had other pieces sold at auction and each piece went for more money than the one before it. In 2021, Love is in the Bin went back to auction and sold for $25. 4 million. What factor most influenced the prices of these pieces?