Pierce Butler, Quaker City Cab Company v. Pennsylvania…
“ Since a state is permitted to impose upon the corporation more than a pro rata share of the common burden of taxation, I find nothing in the Federal Constitution which prohibits it from adopting any of the familiar kinds of taxes as the means of the heavier imposition. Surely, there is nothing inherently objectionable in the long-established, commonly used, gross earnings tax, which should prevent its being selected for that purpose. ”
