The bond market is sending a message Washington does not want to hear, and one of the country's most closely watched economists says the pain is far from over.
Steve Hanke, professor of applied economics at Johns Hopkins and a special counselor at the Center for Financial Stability, told Fortune that President Trump has inadvertently mixed 'a deadly cocktail' for U.S. Treasuries. The result: a bond selloff that has already pushed yields past the informal threshold Treasury Secretary Scott Bessent has been working to defend.
'The bond vigilantes have come out of hibernation,' Hanke said, invoking the term coined by economist Ed Yardeni in a 1983 paper. Yardeni wrote that if fiscal and monetary authorities would not regulate the economy, 'the bond investors will.' Hanke said he will be 'very bearish' on bonds 'for quite some time,' and expects the 10-year yield could climb another 50 basis points from current levels.
Three forces, one direction
Hanke ranked three distinct drivers behind the selloff. The first — and most important, in his view — is monetary. He pointed to Divisia M4, the broadest measure of the money supply tracked by monetary economist William Barnett and produced by the Center for Financial Stability. That gauge is growing at 6.7% year-over-year, above Hanke's own 'Golden Growth Rate' of roughly 6%, the pace he considers consistent with the Fed's 2% inflation target.
Hanke described the dynamic through what he calls a 'bathtub' framework: the massive pandemic-era liquidity bubble has largely drained, and the tub is now refilling. 'It's going to be a long time until inflation is at 2%,' he said. 'The inflation genie's out of the bottle, and it's not going back in.'
Bessent's red line, already crossed
Bessent has said publicly he wants the 10-year yield to carry a '3 handle' — meaning below 4%. Multiple reports describe a widely understood marker around 4.5% on the 10-year and 5% on the 30-year as his effective red line. Hanke called it a 'commonly understood red line, not unique to Hanke.'
The most concrete sign of official alarm came on July 31, the same day the 30-year yield hit 5.27%. The U.S. joined Japan in a coordinated yen-buying operation — the first joint currency intervention between the two countries since 1998. The explicit concern was that a falling yen would push Tokyo to sell a portion of its $1.114 trillion in U.S. Treasury holdings to defend its currency, sending yields even higher. Bessent's notepad from a Camp David cabinet meeting visibly listed 'Buy Japanese Yen (JPY) $5–10 bil.'
Bloomberg reporting from early August separately described Bessent signaling his focus on the 10-year yield because it underpins mortgage rates and other consumer borrowing costs. Reuters framed the current yield curve moves as exposing 'Trump's and Bessent's rate dilemma.'
What it means
The numbers come first, and here they are unambiguous: a 10-year yield above 4.5%, a 30-year at 5.27%, and a money supply growing faster than the rate consistent with price stability. Every basis point above Bessent's red line is a direct tax on every American carrying a mortgage, a car loan, or a small-business credit line.
Free-market readers should note the irony: the bond market — the one asset class Hanke says is still pricing risk correctly — is doing exactly what Yardeni described in 1983. When governments spend beyond their means and monetary authorities lose discipline, capital imposes the discipline that politicians will not. The vigilantes are not the problem. The spending is.
