Consider the demand schedule for salmon in a market with two consumers, Derek and Meredith:
Price of salmon
(per pound) Derek's demand
(per month) Meredith's demand
(per month)
$20.00 0 0
$17.50 0 1
$15.00 1 2
$12.50 1 3
$10.00 2 4
$7.50 2 5
$5.00 3 6
$2.50 3 7
$0.00 4 8

What is the quantity demanded by the market at a price of $12.50 per pound?

4 (1+3)