Q18_16; Two firms (firm A and firm B) are competing in Cournot Duopoly. Assume quantity QB is on the vertical axis and quantity QA is on the horizontal axis. How does an increase in the marginal cost of firm A affect the Cournot duopoly equilibrium? 1. It increases the output level of both Firm A and Firm B. 2. It decreases the output level of both Firm A and Firm B. 3. It has no effect on the output levels of Firm A and Firm B. 4. It decreases the output level of Firm A and increases the output level of Firm B. 5. It increases the market price but has no effect on the output levels of Firm A and Firm B. Note: Enter your chosen answer as a numeric value: 1,2,3,4, or 5