Warren Buffett should have invested in Tesla when it was worth 0.1% as much, Elon Musk says

• Warren Buffett should have invested in Tesla early on, Elon Musk says.

• Buffett could have bought in when Tesla was worth 0.1% as much, or less than $7 billion, Musk says.

• Musk and Buffett have traded numerous compliments and jabs over the years.

Warren Buffett should have invested in Tesla when it was worth a tiny fraction as much, Elon Musk says.

"Too bad he didn't invest in Tesla when it was 0.1% of today's value lol," Musk said in a X post over the weekend.

The Tesla and SpaceX CEO and X owner was responding to George Mack, who writes a newsletter about the best 0.1% of ideas, videos, and articles he creates or comes across. Mack had posted an analysis of a question that Buffett once posed a college class: "If you could invest in a friend and get 10% of their income for life -- who would you pick?"

Musk's post suggests that Buffett's Berkshire Hathaway could have bought into Tesla when it was worth less than $700 million, given the electric-vehicle maker's market capitalization was $682 billion at Friday's close. If Buffett had invested, say, $70 million for a 10% stake, the position would now be worth about 1,000 times as much or $70 billion today, assuming no dilution.