Robyn Greenwood's research identified 40 historical instances in the U.S. stock market where an industry's stock prices at least doubled within two years.

Robyn Greenwood and his colleagues titled their research paper "Bubbles for Fama" in response to Eugene Fama's skepticism.

Robyn Greenwood and his colleagues were motivated by Eugene Fama's challenge to empirically prove the existence of bubbles, leading to their research on statistically identifying them.

Of the 40 historical instances of rapid industry stock price increases identified by Robyn Greenwood's research, approximately half resulted in a dramatic crash within a few years, while the other hal...

According to Robyn Greenwood's research, accelerating stock price increases is one of the strongest predictors of a market bubble.

In their research on market bubbles, Robyn Greenwood and his colleagues analyzed nearly a century of U.S. stock market data, identifying all instances where an industry's stock prices doubled or more ...

A running joke at Harvard Business School's Shad gym suggests that widespread discussion of an industry there is a good indicator of a market bubble.

NVIDIA's current price-to-earnings (P/E) ratio is in the 40s.

The average price-to-earnings (P/E) ratio for companies in the S&P 500 is approximately in the 20s.

Major AI companies like Meta, Microsoft, and Google are not primarily funding their new data centers through new stock issuance.