Yeah they moved experience from raptors to krugs , just don ' t waste time bot , you have much more killpressure top <| sep |> The thing to understand about economy of scale is that it isn ' t an automatic thing that happens when you make a lot of something massproduction of F 9 is cheap because they ' ve made the investment in tooling , in the assembly line processes , to make production efficient . If they slow down production , a lot of that investment will remain intact . Now , maintaining that efficiency has overhead costs high floor space consumption , keeping people on the payroll nevertheless , it won ' t got back to the cost it was before production scaled up . Also , mass production isn ' t the only reason it ' s cheap . They ' ve engineered it to be easy to manufacture , and according to a SpaceX employee in this sub , further manufacturability improvements are a big part of the recent upgrades . So , F 9 s will remain inexpensive rockets .