Final answer:
The market quantity demanded at a price of $15 is -14, but since quantity demanded cannot be negative, there is no market quantity demanded at that price.
Step-by-step explanation:
The market quantity demanded at a price of $15 can be determined by substituting the price into the demand equation. The demand equation is given as Qd = 16 - 2P, where Qd represents the quantity demanded and P represents the price. By plugging in $15 for P, we can calculate the quantity demanded:
Qd = 16 - 2(15) = 16 - 30 = -14
Therefore, at a price of $15, the market quantity demanded is -14. However, since quantity demanded cannot be negative, we can conclude that there is no market quantity demanded at a price of $15.