Summary

Wiley Blount Rutledge Nippert v. City of Richmond — Opinion of the Court

But the cumulative effect, practically speaking, of flat municipal taxes laid in succession upon the itinerant merchant as he passes from town to town is obviously greater than that of any tax of state-wide application likely to be laid by the legislature itself. And it is almost as obvious that the cumulative burden will be felt more strongly by the out-of-state itinerant than by the one who confines his movement within the state or the salesman who operates within a single community or only a few.
Source: Wikisource

Wiley Blount Rutledge Nippert v. City of Richmond — Opinion of the Court

For the situation is difficult to think of in which some incident of an interstate transaction taking place within a state could not be segregated by an act of mental gymnastics and made the fulcrum of the tax. All interstate commerce takes place within the confines of the states and necessarily involves 'incidents' occurring within each state through which it passes or with which it is connected in fact.
Source: Wikisource

Wiley Blount Rutledge Nippert v. City of Richmond — Opinion of the Court

This, of course, is but another way of saying that the very difference between interstate and local trade, taken in conjunction with the inherent character of the tax, makes equality of application as between those two classes of commerce, generally speaking, impossible.
It is true that the tax may strike as heavily upon some Virginia solicitors, and even upon some who confine themselves to Richmond, as it does upon others who come periodically or otherwise from Washington, New York or Cedar Rapids.
Source: Wikisource

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