> Tesla is a vertically integrated company, so they have squeezed all the margins out of their supply chain. The big automakers all share their supply chain and have to feed it with margins at every level. Same story with SpaceX - vertically integrated.
Vertical integration doesn't guarantee better prices just because you don't rely on third party suppliers. There are other benefits, such as monopolizing a certain part of the supply chain (like batteries in the case of Tesla) but it also requires very high investments (Gigafactory). Those investments can pay off in the future but can also turn out to be very expensive mistakes - you basically wager long term pay offs against flexibility.
Vertical integration doesn't guarantee better prices just because you don't rely on third party suppliers. There are other benefits, such as monopolizing a certain part of the supply chain (like batteries in the case of Tesla) but it also requires very high investments (Gigafactory). Those investments can pay off in the future but can also turn out to be very expensive mistakes - you basically wager long term pay offs against flexibility.