It would just cause deflation. Everyone who now has their margins eroded now has less money to spend on things. Apply this to everyone and whatever good/service

It would just cause deflation. Everyone who now has their margins eroded now has less money to spend on things. Apply this to everyone and whatever good/service they provide and you end up with everyone having less to spend on goods and services that cost less. The only people that win are those that aren't subject to price transparency and compressed margins, which would likely end up being just those that work for the government, because that's a cost-plus activity.