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After reading 1449 websites, we found 3 different results for "Who first mentioned irrational exuberance"
Alan Greenspan
Alan Greenspan did mention “irrational exuberance” once in 1996 but then stayed silent as the dot.com boom really took off.
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Allen Greenspan who was then chairman of the Federal Reserve
Just over two decades ago Allen Greenspan who was then chairman of the Federal Reserve coined the term irrational exuberance, however, greed might have been just appropriate.
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Alan Greenspanused
And then a few days later, Alan Greenspanused the words "irrational exuberance," which became the title of a book of yours.
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