Charles Evans Hughes, James v. Dravo Contracting Company…
“ As in the Panhandle Case, so in the present, the receipt of the thing contracted for constitutes the transaction by which the tax is measured and on which the burden rests. We may thus paraphrase what was there said: To use the value and amount of the goods and services furnished to the United States as a measure of the tax is in substance and effect to tax the transaction itself. The amount of the tax rises and falls in direct ratio to the contract value of the goods and services rendered to the government. This is to tax the sale; and that is to tax the United States. ”
