Buffett has said that Return On Equity (ROE) is one of the best valuation metrics, and it is one of the key metrics for looking at corporate profitability。

On March 1, local time, Tesla's much-anticipated Investor Day event was held as scheduled at the Superplant in Austin, Texas, and the third part of the electric car maker's CEO Elon Musk's previously much-hyped "ambitious plan" was unveiled.。