The 1920s is known as the jazz age. what does that tell you about jazz music?

a. jazz was the only kind of music played during the 1920s.

b. jazz was an important element of american culture during the 1920s.

c. jazz music was popular only during the 1920s, and no one listens to it anymore

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