Before Congress said let’s buy a suit for a wedding. There was only really one tailor.
Tailor says how much have you got.
Congress says $1 billion but that’s all I’ve got so not a dollar more.
Tailor says ‘sure I can make that work’...
Fast forward, suit is half way done, wedding is tomorrow, tailor says ‘It’s gonna cost your another billion’ or you get nothing. Congress pays and hopes the wife won’t notice. This happens over and over again.
Fast forward to 2020. Finally there’s more than one tailor. Several in fact. The suits are already made and bought off the rack and simply adjusted to fit.
Now congress gets to go shopping and has a range of suits to choose from. Original tailor is in deep shit.
Instead is spending billions on a suit and waiting forever, they pop down to ZOZO and pick one out and pay $100m. What a bargain I’ll take ten.
New tailors in this case - SpaceX, Rocket Lab, Blue Origin in this case.
Note that doing this is much harder than it sounds, because NASA does not get to decide what kinds of contracts they sign. This is decided by congress, who is still saddling NASA with billion+ dollar cost+ contracts on the SLS rocket.