. Hamburgers and Catsup are complements in consumption. Hamburgers and Salmon are substitutes in consumption. During November, the B.C. Salmon migration occurs. Fishermen catch unusually large quantities of the fish. a. Explain how an increase in supply in the fish industry is likely to affect the equilibrium price of catsup. When the supply of salmon rises the price of salmon will fall. This will cause a reduction in the demand for hamburgers. The lower price of hamburgers will cause an increase in the demand for catsup and an increase in the price of catsup. b. Which combination of elasticities will result in the largest increase in the price of catsup? The price of salmon will change most dramatically when the demand for salmon is inelastic. The price of hamburgers will fall most when the supply of hamburgers in inelastic. The price of catsup will rise by the most when the supply of catsup is inelastic.