You are a manager at Lobster Brisk, a seafood restaurant chain similar to Red Lobster.

Your supervisor asks you to determine the quantity of lobster to buy for the chain’s Brisk Feast, an annual month-long promotion when Lobster Brisk features a variety of lobster dinners, including its signature lobster bisque soup. Your research department reports that the demand for lobster dinners is Qd = 1,300,000 dinners - 1100,000 dinners * P2 + 132 dinners * INCOME2 where Qd is the quantity of lobster dinners demanded per week, P is the price of a lobster dinner, and INCOME is the average family income of Lobster Brisk customers.

a. If the average family income of Lobster Brisk customers is $40,000 and you set the price of a lobster dinner at $18 per dinner, what is the quantity of dinners demanded?

b. If you raise the price of a lobster dinner from $18 to $20 and the average family income remains equal to $40,000, what is the change in the quantity of dinners demanded? Is there a movement along the demand curve or a shift of the curve?

c. With the price of a lobster dinner set at $20, what is the change in the quantity of dinners demanded if your advertising brings in families with an average income of

$42,000 rather than $40,000? Is there a movement along the demand curve, or does the curve shift?