<human>:  Why did Elon Musk leave PayPal?
<bot>: Elon Musk left PayPal to start Tesla Motors. He had a vision for a new kind of car company that was electric and could make a profit. He wanted to create a company that could make a profit while also doing good things for the environment. He also wanted to create a company that could compete with the oil companies and bring down the price of gasoline. He wanted to create a company that could be a leader in sustainable transportation.