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‘Irrational exuberance’ stock gauge sparks fresh bubble worries

Alexandra Semenova / Bloomberg
Alexandra Semenova / Bloomberg • 3 min read
‘Irrational exuberance’ stock gauge sparks fresh bubble worries
Barclays sees abundant signs of froth, with listings of new blank-check companies in 2025 already surpassing the last two years combined. Photo: Bloomberg
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Wall Street speculators have returned in full force: US stocks have snapped back from the throes of April’s tariff selloff, hovering near record highs, the pipeline of new SPACs is rebounding and Cathie Wood’s flagship fund is on a historic tear.

That’s sparked a swift jump in a Barclays measure of the market’s “irrational exuberance” — a phrase coined by former US Federal Reserve (US Fed) Chair Alan Greenspan for when prices exceed assets’ fundamental values.

The one-month average on the proprietary gauge has swung back into the double-digits for the first time since February — reaching levels that have signaled extreme frothiness in the past.

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