1. Tesla could start a car insurance business. Mainly to serve Tesla car owners. At an average of 2 million miles per accident, This business should be very profitable, bring in almost $1B profit in 2020, and doubles the profit every 2 years. I think most Tesla car owners would be willing to give their insurance business to Tesla. 2. Tesla could start a software/online business, make it capital light, deals with billions of customers. It could be games, news, social network, music, learning, or banking, ..., Tesla has so many fans around the world, if planned well, this business can become profitable relatively quickly. If an online business has a lot of users, the ads money alone would be quite significant. Use the profit from the above businesses to buy back Tesla shares.