I think what's missing in your (and the plaintiff's) analysis is that the government did not illegally tax you, it illegally taxed importers. The fact that thos

I think what's missing in your (and the plaintiff's) analysis is that the government did not illegally tax you, it illegally taxed importers. The fact that those importers "chose" to raise their prices as a reaction is their business decision. I think what you and the plaintiff need to show (direct connection between supplier costs and consumer prices) fundamentally goes against free business in the US. I mean, companies change prices all the time for whatever reasons they want, no? But IANAL, "unjust enrichment" is apparently a real claim (though not sure if it applies to a store-consumer relationship) and consumer protection laws exist, so maybe I'm wrong.