Supreme Court rules 9-0 in Wickard v. Filburn that Congress can regulate wheat grown for home use because aggregate national production substantially affects interstate commerce

The Supreme Court unanimously upheld the AAA penalty against Roscoe Filburn, ruling that Congress could regulate even purely local wheat production under the Commerce Clause. Justice Robert Jackson's opinion introduced the aggregation principle: even if Filburn's individual 239 bushels had no market effect, the collective impact of all farmers growing excess wheat for home use substantially affected interstate wheat prices. The ruling extended federal Commerce Clause authority further than any prior decision.