Dear Tutor, please answer the following questions and explain the reason the other answers are not correct. Thanks! Price ($) S1 K $2 D 50 Quantity Figure 4 21. Refer to Figure 4. Suppose a technological innovation reduces firms' costs, particularly at higher levels of production. If this market is perfectly competitive, what is the impact on producer surplus? a) Producer surplus decreases from $450 to $0 b) Producer surplus remains constant c) Producer surplus increases from $450 to $1,350 d) Producer surplus increases from $450 to $1,800 For the above question #21, My answer is a), is it correct