The “Shiller PE Ratio” is at its highest level since November of 1999. That was at the peak of the online gold rush right before the dot com bubble burst in 2000. Today on the show, we learn what the Shiller PE Ratio is, how it works and whether we should be worried that it’s relatively high right now.

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For sponsor-free episodes of The Indicator from Planet Money, subscribe to Planet Money+ via Apple Podcasts or at plus.npr.org . Fact-checking by Tyler Jones. Music by Drop Electric . Find us: TikTok , Instagram , Facebook , Newsletter .

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