9. Search costs are (1) The point at which quantity demanded
and quantity supplied are equal.
(2) The financial and opportunity costs
consumers pay when looking for a good or
service.
(3) A situation in which quantity supplied is
greater than quantity demanded; also
known as excess supply.
(4) A situation in which quantity demanded
is greater than quantity supplied; also
known as excess demand.

Power plants that rely on coal increase the amount of sulfur dioxide that dissolves into the air, eventually increasing the acidity of precipitation. the higher acidity of rain and snow can damage forests by making it more difficult for plants to absorb minerals from the soil. the equations below provide information about the market demand and supply of electricity. there is a constant marginal external cost of $25 per unit of electricity.d: qd= 200 – 2ps: qs=p – 10what quantity of electricity satisfies allocative efficiency in this market? a. 60b. 70c. 50d. 43.3