The Aggregate effects doctrine, Cumulative effects doctrine, or substantial effects doctrine is a legal doctrine in United States federal law. The AED permits extension of the regulation of interstate commerce into any action which affects interstate commerce only when aggregated with other actions. It is most often associated with Wickard v. Filburn (1942). In Wickard a wheat farmer growing wheat solely for animal feed within the confines of his own farm was found to be regulatable because private growth for private consumption was the primary reason for decrease of demand.

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