Robinson-Patman Act (1936)
Congress passed the Robinson-Patman Act to ban price discrimination that harmed competition — charging different buyers different prices for the same goods. It targeted chain stores undercutting independent retailers.
The law made it illegal to sell the same product to different buyers at different prices when it reduced competition.
Enforcement faded over decades, but it remains the foundational US law against price discrimination.
Seattle's ordinance is a modern, data-driven extension of the same idea: the same groceries should cost the same regardless of who the buyer is.
