2009 AL 20

A. (wrong)
uncertain. not enough information to tell

B. (wrong)
also uncertain.
price control did not contribute to whether there is a more even income distribution

**C. (wrong)
the market is always in equilibrium.
price comp. + non-price comp. = equilibrium

D. (correct)
when the monetary price cannot clear the market.
non-price competition emerged and helped to clear the market.