The electric car company run by Elon Musk is facing increasing competition, but investors have focused mostly on the prospects for Tesla’s self-driving technology.

The electric-car company led by Elon Musk no longer has the market to itself. Investors are focusing on autonomous driving and other new technologies.

Sales of the company’s cars are flagging, but investors are focusing on the potential of autonomous driving and Mr. Musk’s ties to President-elect Donald J. Trump.