In scores of countries the movement of goods across a city limit or a county line or the boundary of a province is taxed. The economies of many European. Asiatic. and Latin American regions groan from the imposition of interstate taxes and obstructions. Only a few countries have adopted the startling principle. written into our own Constitution. that trade between citizens of a single nationand. let us say. between regionsshall move unhampered. No multiplicationi of TVAs for Asia can ever do for the Asian individual what the simple previsions of our Constitution regarding rights in property have done for American citizens.