20. If the price of a firm's variable input increases,
which of the following will occur?
(A) The firm will decrease its level of production,
(B) The price of the good will decrease in the
short run.
(C) The firm's marginal costs will decrease
at every level of output. .
(D) The firm's average fixed cost will decrease.
E) More firms will enter the industry in the
long run.

answer; (d) anthropology;

elastic potential energy

changes in factors like average income and preferences can cause an entire demand curve to shift right or left. this causes a higher or lower quantity to be demanded at a given price. demand curves relate the prices and quantities demanded assuming no other factors change. it is important for consumers to know this information, because it is crucial for them to know what they can afford and can't afford. i hope this .

the correct answer is a