Owen J. Roberts, Dupont v. United States — Opinion of the Court
“ The tax is not upon the business transacted but is an excise upon the privilege, opportunity, or facility offered at exchanges for the transaction of the business. It is an excise upon the facilities used in the transaction of the business separate and apart from the business itself. [5] In this view it is immaterial whether the transfer of the account constituted a sale. Unquestionably the petitioners used the facilities of the exchange for offsetting their obligation as a purchasing broker by arranging that another broker should take over that obligation under the rules of the exchange. ”
