Capacity constrained Bertrand. Use diagrams and verbal argument to explain the following results from the capacity constrained Bertrand oligopoly model. a) (5 marks). It is not an equilibrium for firms to charge different prices. b) (5 marks). It is not an equilibrium for all firms to charge a price which yields excess capacity. c) (5 marks). It is not an equilibrium for firms to charge a price which yields excess demand. d) (5 marks). It is not an equilibrium for firms to charge a price which clears the market if they choose capacities which are greater than Cournot capacities.