What was the effect of the 16th amendment?
a. it allowed workers to take industrialist to court for proper wages and benefits.
b. it granted congress the power to tax incomes.
c. it permitted women the right to take business to court for equal pay.
d. it declared settlement houses to be illegal.

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