When excess demand exists for tickets to a major sporting event or a concert, profit opportunities exist for scalpers. a) draw the line for the supply curve for tickets to a sold-out venue that holds 20,000 people. b) draw a line that illustrates the face-value price of $50 per ticket. c) plot the equilibrium price that will prevail in the market if scalpers in the market if scalpers are allowed to operate in the black market. d) plot the point which indicates the quantity demanded at the face-value price.