7 reasons short sellers are betting against Tesla

Tesla Chief Executive Elon Musk is seen in December in Australia. Tesla Chief Executive Elon Musk is seen in December in Australia. But can the electric car maker itself accelerate from producing 80,000 autos a year to 500,000 in 2018? Can it make money in the process? Here's how it works: Short sellers borrow shares in companies they think are overvalued.