Self-described “long-term optimist” Elon Musk made another bold prediction about his car company. That isn’t necessarily good news for Tesla’s stock price. On Saturday, Musk tweeted that Tesla’s earnings could grow tenfold over the coming five years if its business execution is “outstanding.

Elon Musk’s car company is required each year to report to investors all the bad things that could happen to it, and the latest version lists every imaginable threat from costly lawsuits to