QUESTION 3 Sue and Jane own the only two local gas stations. They have identical constant marginal costs, but earn zero economic profits. Sue and Jane constitute: O a Sweezy oligopoly. O a Cournot oligopoly. O a Bertrand oligopoly. O None of the answers is correct. QUESTION 4 If firms are in Cournot equilibrium, they could increase profits by: O jointly increasing output. O jointly reducing output. O unilaterally increasing prices. O unilaterally reducing prices