Elon Musk likes what he sees on the short end of the Treasury curve.

On his social media micro-blogging site X, the billionaire automaker and space exploration pioneer called short term Treasury bills “a no-brainer.”

He made the comments in response to a tweet by the head of Pershing Square Capital Management, Bill Ackman.

Ackman had posted on Wednesday that Pershing was short 30-year Treasury bonds, and that his firm used them to hedge against the effects of higher rates on stocks, as well as a “standalone” bet. He later echoed Warren Buffett, the Chairman and CEO of Berkshire Hathaway Inc., on Thursday, noting that Pershing also uses the shorter term bills in cash management.

On Thursday Buffet had commented that Berkshire was not planning to stop buying Treasury bills after Fitch Ratings had downgraded the US earlier in the week.

Meanwhile long-duration Treasuries are still on pace for the worst week of 2023. On top of the downgrade, there were larger than expected auctions this month, and a move to ease the cap on domestic bond yields by the Bank of Japan.

Although Bloomberg requested Musk’s opinions on 10- and 30-year Treasuries, Musk did not respond immediately.