I was a factory Rep for Milwaukee Tool, Coffing Hoist, Duff Norton, Perfecting and etc back when industrial tool supply houses were the only sources - no Home Depot, Lowes, ebay etc. All the companies were owned by the Amstar Corp "Domino Sugar". The sugar folks got nailed price-fixing internationally-Federally and fined big-time. (anyone remember a sugar shortage in 70s?)
With Amstar being under the gun, every six-months I had to sign my life away stating I'd not talk to competitors, could not suggest pricing to distributors, could not even look at competitors price sheets etc. It's surprising how little a manufacturer can legally influence sale prices. JMHO These minimum "selling prices" today would crumble like sand if ever challenged in court - but why bother $?