Which of the following is a current U. S. Senator from Tennessee? a Bill Lee
b Marsha Blackburn
С David Briley
d Nancy Pelosi

One drawback of voluntary trade is that it a.requires two groups to use a common language b.can make one group dependent upon another for necessary goods c.doesn't occur unless there is a shortage of goods for at least one group d.forces groups to rely on themselves to produce all the goods they need