Comment by bell-cot
18 hours ago
Pre-1980's, it seems to have been enforced well enough to keep a whole lot of mom-and-pop grocery stores in business.
I'm thinking the faded-out enforcement was due to a certain 1980's President, and his administration's "Greed is God" ethos. A lot of protections for the little guy got dumped on his watch.
You don’t have to guess. Wikipedia’s cite for the claim of decline says:
Enforcement of the RPA is overseen by the Federal Trade Commission, but cases have declined since the 1980s due to the complexity of the law and the requirement to prove intended damages. Juries in recent cases claiming RPA violations have not found the defendants guilty.