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In the monopolistic competition diagram described (TR = $2800 at P = $28 and Q = 100, and ATC = $22 at Q = 100), what are the total costs and economic profits for the firm?

Consider the diagram at the right depicting the revenue and cost conditions faced by a monopolistically competitive firm. What are the total revenues experienced by this firm? $2800. What are the tota...
Consider the diagram at the right depicting the revenue and cost conditions faced by a monopolistically competitive firm. What are the total revenues experienced by this firm? $2800. What are the total costs experienced by this firm? $_____. Diagram shows: Revenues and Costs ($ per unit) on the y-axis from 10 to 40, Quantity (units per day) on the x-axis from 0 to 280. MC, ATC, MR, and D curves are shown with points at intersections labeled with coordinates 28 at quantity 160, 22 at quantity 100, and 18 at quantity 120.
In the monopolistic competition diagram described (TR = $2800 at P = $28 and Q = 100, and ATC = $22...
Answer

Total cost is $2200 and economic profit is $600. Since $TR = P\times Q = 28\times 100 = 2800$ and $ATC = 22$ at $Q=100$, total cost is $TC = ATC\times Q = 22\times 100 = 2200$. Economic profit equals $\pi = TR - TC = 2800 - 2200 = 600$.

Explanation

What the diagram is telling you

To find economic profit from a monopolistic competition graph, you read the firmโ€™s price and quantity (to get total revenue), then read $ATC$ at that same quantity (to get total cost).

Total revenue from price and quantity

From the prompt, total revenue is already given as $TR = \$2800$, which is consistent with: $$TR = P\times Q = 28\times 100 = 2800.$$

Total cost from the ATC curve

At the output level $Q=100$, the diagram indicates $ATC = \$22$ per unit. So: $$TC = ATC\times Q = 22\times 100 = 2200.$$

Economic profit (or loss)

Economic profit is: $$\pi = TR - TC = 2800 - 2200 = 600.$$ Because this value is positive, the firm earns an economic profit of $\$600$.

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