Answer:
the firm should shut down, at least temporarily until the marginal revenue increases or definitely if the marginal revenue doesn't increase
Step-by-step explanation:
if average total costs = $6 and average fixed costs = $2, then average variable costs = $6 - $2 = $4
since the average variable costs are higher than marginal revenue: $4 > $3, then the company is losing money (-$1) every time it sells its products.