Final answer:
The firm should produce more output in order to maximize their profits.
Step-by-step explanation:
The firm should produce more output in order to maximize their profits. When the price of the firm's output is higher than the marginal cost of producing one more unit of output, it is profitable to increase production.
In this case, the price of the firm's output is $4 per box and the marginal cost is $2 per box.
Since the price is higher than the marginal cost, the firm should produce more in order to increase their profits.