"The defect of power in the existing confederacy, to regulate the commerce between its several members is in the number of those which have been clearly pointed out by experience . . . . A very material object of this power was the relief of the States which import and export through other States from the improper contributions levied on them by the latter."

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I own myself the friend to a very free system of commerce, and hold it as a truth, that commercial shackles are generally unjust, oppressive and impolitic - it is also a truth, that if industry and labour are left to take their own course, they will generally be directed to those objects which are the most productive, and this in a more certain and direct manner than the wisdom of the most enlightened legislature could point out.

— James Madison