https://phys.org/news/2018-07-tesla-3s-week.html

The Model 3, which starts at $35,000, is the key to turning Tesla from a niche maker of expensive electric cars to a profitable, mass-market automaker. The company badly needs cash from the compact cars to deliver on CEO Elon Musk's promise to post a net profit and positive cash flow in the third and fourth quarters. The company has had only two profitable quarters in its 15-year history.

To hit the 5,000-per-week mark, Tesla had to erect a fourth assembly line under a tent outside its Fremont, California, factory, and Musk had to spend nights in the plant working out bugs with automation and other problems.