Later, Musk realized that he could start a company that could build the rockets he needed. Musk calculated that the raw materials for building a rocket were actually 3% of the price of a rocket at the time, according to Steve Jurvetson (who has invested money in SpaceX). Making around 85% of launch hardware in-house, was one main reason why launch prices could become ten times cheaper; Using ways of easily changing software (or software engineering), was another main reason.
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