This is not new. It is as old as financial capitalism itself. The late Hyman Minsky, who taught at the University of California, Berkeley, laid down the canonical model. The process starts with "displacement", some event that changes people's perceptions of the future. Then come rising prices in the affected sector. The third stage is easy credit and its handmaiden, financial innovation.
The fourth stage is over-trading, when markets depend on a fresh supply of "greater fools". The fifth stage is euphoria, when the ignorant hope to enjoy the wealth gained by those who came before them. The warnings of those who cry "bubble" are ridiculed, because these Cassandras have been wrong for so long. In the sixth stage comes insider profit-taking. Finally, comes revulsion.
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