What is a barter economy? How effective would a bartering system be in today’s economy? Explain.

what are the issues?

powers  are  denied  to the  national governmentin three distinct ways: some  powers, such as the  power  to levy duties on exports or prohibit the freedom of religion, speech, press, or assembly, are expressly  denied  to the  national government  in the  constitution.

the constitution gives congress the power to regulate commerce "among" the several states.