Steve Keen, formerly a professor at the University of Western Sydney, is known for claiming more loudly and confidently than just about anyone else on the planet that he "predicted the global financial crisis". According to Keen, this should be a reason to believe his extensive critiques of neoclassical (i.e. mainstream) economics, and his suggested alternative paradigm, known as "Post-Keynesianism".
So in what way did Keen "predict the crisis"?
Searching the internet, I can find no record of an ex-ante prediction by Keen of a large-scale U.S. housing bubble. He did, however, predict an Australian housing bubble, in 2007 after the U.S. housing bubble had already begun to pop. That prediction has so far yet to materialize; Australian housing prices have not collapsed yet. As a result of this incorrect prediction, Keen lost a high-profile bet.
Did Keen predict the collapse of the U.S. finance industry (the Lehman shock and subsequent bailouts)? Not that I can find. Nor did he warn of the risk of such an industry collapse, as far as I can find.
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