Karl has the following demand curve for hamburgers: q∗h= 200-3Ph+ 0.25Ps where qh is the number of hamburgers he buys, Ph is the price of hamburgers, and Ps is the price of steaks. Suppose Ph= 5 and Ps= 20.
a. What is Karl's demand for hamburgers at those prices?
b. Calculate the (own-price) elasticity of demand for hamburgers at those prices. Is Karl's demand elastic or inelastic?
c. Calculate the cross-price elasticity of demand for hamburgers and steaks at those prices.
Are steaks and hamburgers complements or substitutes?