Which of these is most likely to lead directly to a black market?
a. a supply shock
c. rationing
b. a price floor
d. equilibrium

c. rationing

Explanation:

Which is an example of a good whose price goes down because of improvements in technology? Why did Communist governments use a command economic system for many years? ... Quantity demanded will exceed quantity supplied, so the price will drop. Excess supply means that producers will make less of the good.

cant without the picture! ?

force tends to be low and long diustance masses are high