The act of sending or carrying goods and merchandise from one country to another. commercial law. The act of sending goods and merchandise from one country to another. 2 Mann. & Gran. 155; 3 Mann. & Gran. 959. 2. In order to preserve equality among the states, in their commercial relations, the constitution provides that no tax or duty shall be laid on articles exported from any state. Art. 1, s. 9. And to prevent a pernicipus interference with the commerce of the nation, the 10th section of the 1st article of the constitution contains the following prohibition: No state shall, without the consent of congress, lay any imposts or duties on imports or exports, except what may be absolutely necessary for executing its inspection laws; and the net produce of all duties and imposts, laid by any state on imports or exports, shall be for the use of the treasury of the United States; and all such laws shall be subject to the revision and control of the congress.