If the Market System Is So Efficient, Why Is It

If the market system is so efficient, why is it not universally used?

A) The rich get richer, and the poor get poorer.
B) Goods and services cannot freely move from one part of the world to another.
C) People are evading taxes, so not all transactions go through the market.
D) The market does not work very well in all situations.
E) Some governments want to control every aspect on their country's economy.