What is the european union?
a union of the six countries of the common market
a regional trade organization of the european nations
a political amalgam of european and asian countries
a pact between europe and the united states regarding tariffs

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