It's late in the party, the music's still playing, and almost everyone is still dancing. Five different gauges of the US stock market are now telling the same story: shares have rarely, if ever, been this expensive. What none of them can tell you is when the song ends. So there are two questions here, really. How stretched has the market become? And what is it that finally stops the music? (Short answer to the second one: liquidity. And there's a date in the diary worth watching.)
You are here · June 202601 · VALUATION
Start with the simplest question at the party: how much are you paying for a dollar of earnings? Take it over a full decade and adjust for inflation, so a single boom year can't flatter the figure, and you've got the Shiller CAPE. It has only been higher once in 140 years: the weeks around the dot-com peak. (And when it's been up here before, the next ten years of returns have tended to disappoint.)
Cyclically-adjusted P/E. Dashed lines: the historical average and the "danger" zone.
Learn more: Robert Shiller's official CAPE data (Yale) · live value at multpl
02 · THE WHOLE MARKET
Now step back from company earnings to the whole market, measured against the economy that feeds it. Buffett called this "probably the best single measure" of where valuations stand, and reckoned that past 200% you're "playing with fire." We're well beyond that now: bigger, relative to the economy, than in either 1929 or 2000.
Percent of GDP. Dashed lines: "fair value" (100%) and "overvalued" (120%).
Learn more: Wilshire 5000 (FRED) ÷ GDP (FRED) · background
03 · THE TIME-BOMB
Look at what's holding the market up. A handful of names now carry the index, which means their fate and the market's are the same trade. And the passive money that pours in every month buys them in proportion to their size, packing the crowd tighter into the same corner. So one stumble doesn't stay one stumble. It becomes everyone's.
Nvidia · Microsoft · Apple · Alphabet · Amazon vs the other 495.
Concentration has more than doubled in a decade.
Learn more: live S&P 500 weights (slickcharts) · S&P Dow Jones Indices
04 · THE SMART MONEY
Leave the stock market for a moment and ask the bond market, historically the more level-headed of the two. When short-term yields climb above long-term ones the curve "inverts", and that has come before every modern US recession. It sat inverted for two years and has only just flipped back the right way up, which (awkwardly) is usually the bit that comes just before the recession itself lands.
Below the zero line = inverted = the classic recession signal.
Learn more: 10Y−3M spread (FRED) · NY Fed recession-probability model
05 · DRY POWDER
Finally, watch the people who've sat through this before. The most patient money in the world has quietly stepped off the dance floor and is standing by the wall with a record pile of cash. Not because it missed the rally, but because it would rather keep its options open and wait for the wreckage to go shopping.
Cash & T-bills, $bn. The 2026 bar is an all-time record.
Learn more: Berkshire Hathaway filings & letters · SEC 10-Q (cash & T-bills)
FINALE · THE TRIGGER
Here's the bit the valuation gauges can't tell you. Expensive markets are dry timber, not a lit match; they can stay expensive for years. What ends the party is liquidity: the moment there are simply more sellers than the buyers can soak up. Three things line up to drain it.
The music stops between December 2026 and May 2027.
That's when the lock-ups expire on the biggest IPOs in a generation (SpaceX, OpenAI, Anthropic) and trillions in insider shares become sellable at once. In musical chairs, nobody minds the music until it stops. This is the verse where it goes quiet: a wall of new supply meeting a market already up on its toes, with the most experienced players long off the floor.