Summary

Portrait of William O. Douglas William O. Douglas Ott v. Mississippi Valley Barge Line Company…

Those requirements are satisfied if the tax is fairly apportioned to the commerce carried on within the State.
There is such an apportionment under the formula of the Pullman case. Moreover, that tax, like taxes on property, taxes on activities confined solely to the taxing State, [4] or taxes on gross receipts apportioned to the business carried on there, [5] has no cumulative effect caused by the interstate character of the business. Hence there is no risk of multiple taxation. Finally, there is no claim in this case that Louisiana's tax discriminates against interstate commerce.
Source: Wikisource

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