President Donald Trump urged Americans to “BE COOL” on Wednesday after turmoil roiled bond markets and yields spiked amid a selloff.

“BE COOL! Everything is going to work out well. The USA will be bigger and better than ever before!” Trump posted on his Truth Social account.

“THIS IS A GREAT TIME TO BUY!!!” he added in a follow-up post.

Yields on 10-year and 30-year bonds jumped overnight amid chaos in the stock market, laying the groundwork for what some experts have predicted could be a major financial crisis. Rising bond yields amid falling stock prices is a rare event that typically correlates with stock market crashes, such as the crashes in 2008 and 2001.

The most recent example of the phenomenon occurred during the COVID pandemic, according to the Financial Times.

The event could presage action by the Federal Reserve to stabilize markets amid the fallout from President Donald Trump’s sweeping tariff regime.

“These sorts of moves, if they continue, will force the hand of policymakers: In the US, the Federal Reserve will have to cut interest rates and/or use its balance sheet to counter bond market malfunction, but at a cost,” said Mohamed El-Erian, president of Queens’ College, Cambridge and chief economic adviser at Allianz SE.

These sorts of moves, if they continue, will force the hand of policymakers:
In the US, the Federal Reserve will have to cut interest rates and/or use its balance sheet to counter bond market malfunction, but at a cost.
In the UK, the Chancellor will have to consider going… pic.twitter.com/SunyMB8NjH

— Mohamed A. El-Erian (@elerianm) April 9, 2025

In an unstable market environment, bond yields typically fall, and prices rise as investors flee to a more stable option away from the stock market. Bond yields rising despite the chaos in the market could suggest deep concern that inflation could surge, an event that economists have warned about with the onset of steep tariff rates announced by Trump last week.

“Whatever you think of the legitimate reasons for the newly announced tariffs — and, of course, there are some — or the long-term effect, good or bad, there are likely to be important short-term effects. We are likely to see inflationary outcomes, not only on imported goods but on domestic prices, as input costs rise and demand increases for domestic products,” JP Morgan Chase CEO Jamie Dimon said. “Whether or not the menu of tariffs causes a recession remains in question, but it will slow down growth.”