The “Warren Buffett Indicator” is a simple yardstick that compares the total U.S. stock market’s value to the size of the U.S. economy. It’s recently surged above 200%, a level Buffett once warned is like “playing with fire,” signaling stretched valuations versus economic output. It’s soared because market values have risen far faster than GDP, driven by mega-cap gains and optimism, pushing the ratio to roughly 217%—well above long-term norms and prior peaks—suggesting elevated risk if profits or growth do ...