For The Question Below I Don’T Understand Why Clause 3 Is True When The Firm Is Producing Its Last Unit

Question

For the question below, I don’t understand why clause 3 is true. When the firm is producing its last unit,

shouldn’t the marginal cost still vary since the two curves have different slopes?

For the following question, use the graph below.
Price
12
i- – – -.
– – – -i- – – – – –
-i- –
Firm A
11
– – – – – — —
10
Firm B
200
400
600
800
1000 1200 Quantity
(/16) The individual supply curves for Firm A and Firm B are shown in the above graph. If the
market price for the good is $5 per unit, which of the following would be TRUE?
Collectively, these two firms would produce 1,400 units.
Firm B will receive a greater amount of producer surplus than Firm A.
The marginal cost of the last unit produced will be the same for both Firm A and Firm B.
a .
I and II only.
The marginal cost of the 200quot; unit produced will be greater for Firm A.than for Firm B.
b. II and IV only.
c. I and III only.
d. I, III, and IV only.
I, II, III, and IV.Microeconomics