Final answer:
The cost reduction of Firm 2 is likely to have a positive impact on its market share.
Step-by-step explanation:
The cost reduction of Firm 2 from 74 to 68 is significant and is likely to have a positive impact on its market share. By reducing its marginal cost, Firm 2 can now produce natural gas at a lower cost compared to Firm 1. This means that Firm 2 can potentially offer a lower price to consumers, giving it a competitive advantage and potentially attracting more customers. As a result, it is expected that Firm 2 will gain a larger market share due to its cost reduction.