Which description best captures Congress's Commerce Clause authority over economic activity?

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The Commerce Clause authority is broad: Congress can regulate the channels of interstate commerce (the routes goods travel) and the instrumentalities used in that commerce (the vehicles, persons, and things involved). Beyond that, it can regulate activities that, when taken together, have a substantial economic effect on interstate commerce. This combination captures both the infrastructure that carries commerce and the way many locally performed activities can influence the national economy when their aggregate impact is substantial. That’s why the best description includes channels, instrumentalities, and activities with substantial economic effect when aggregated. For example, even intrastate activity can be regulated if its collective impact on interstate commerce is substantial, as shown by the traditional substantial-effects doctrine. Choices that limit regulation to goods crossing state lines or that deny any regulatory power miss these broader aspects.