the words "hot" and "air" cross my mind.
It reminds me of the comic book boom & bust. See "The speculator boom" and the "Bust of the speculator market", in this Wikipedia article : https://en.wikipedia...book_collecting
The news media had started publishing articles about the skyrocketing value of US comic books from the early 20th century. People started 'investing' and publishers began producing new comic book lines. The speculators gobbled up any comic books and the prices boooomed!
The problem was that it was the old comic books that had risen in price and not the newer ones. The speculators inflated the market by investing in any comic book, no matter how new it was. The speculators kept bidding against each other until their market crashed.
They had begun to treat comics as if they were gold or silver.
Speculative Investment always has a Boom & Bust cycle, but the comic book craze was an extreme example.
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