Fair-Return Price (Average-Cost Pricing)
What is Fair-Return Price (Average-Cost Pricing)?
A fair-return price regulates a natural monopoly at the point where price equals average total cost (P = ATC), so the firm earns zero economic (normal) profit.
Because marginal-cost pricing forces a loss-making price on a natural monopoly, regulators commonly set price where the demand curve crosses the ATC curve. At this fair-return (average-cost) price the firm covers all costs including a normal profit, needing no subsidy, while producing more and charging less than an unregulated monopoly would. The catch is that it is not fully efficient: price still exceeds marginal cost (P > MC), so some deadweight loss remains. It is the standard real-world regulatory compromise.
Fair-Return Price (Average-Cost Pricing): a worked example
Take a cable utility with demand P = 38 minus 0.4Q, a constant marginal cost of 6 dollars, and a fixed cost of 600 dollars, so average total cost is 600 over Q, plus 6. Fair return pricing looks for the lowest price at which revenue still covers total cost, which is where demand meets ATC. At Q = 50 the demand price is 38 minus 20, or 18 dollars, and ATC is 600 over 50 plus 6, which is 12 plus 6, or 18 dollars. Check the profit: revenue of 50 times 18 is 900 dollars, and total cost of 600 plus 6 times 50 is also 900 dollars, so economic profit is zero. Compare the efficient point, P = MC = 6, where demand gives Q = 80. The firm survives without a subsidy, but 30 units of mutually beneficial output go unmade, leaving deadweight loss of one half times 30 times 12, or 180 dollars.
The mistake students make with fair-return price (average-cost pricing)
A frequent mistake is placing the fair return price at the minimum of average total cost, where marginal cost crosses ATC on a textbook U shaped diagram. A regulator has to name a price customers will actually pay, so the point must sit on the demand curve, which makes it the demand and ATC intersection. For a natural monopoly that lands on the falling stretch of ATC, above minimum average cost. The same error in a second costume is reading ATC at the unregulated monopoly's quantity and calling that number the regulated price.
Fair-Return Price (Average-Cost Pricing) questions
Why do regulators use a fair-return price instead of the socially optimal price?
Fair return pricing keeps the firm solvent without a subsidy. Setting price at marginal cost would be allocatively efficient, but a natural monopoly's marginal cost lies below its average total cost, so that price generates losses taxpayers must fund year after year. Regulators trade a slice of efficiency for financial independence, accepting a price above marginal cost in exchange for a firm that covers its own costs and keeps operating.
Does fair-return pricing eliminate deadweight loss?
Fair return pricing shrinks deadweight loss without removing it. Price still exceeds marginal cost at the regulated quantity, so units that buyers value above their production cost never get made, and a smaller welfare triangle survives between the regulated output and the allocatively efficient output. The gain over an unregulated monopoly is real, since output rises, price falls, and the excess profit disappears, but the outcome stays second best.
What does zero economic profit mean for a regulated utility?
Zero economic profit means total revenue exactly covers total cost, including the normal profit investors require to keep their money in the business. Owners are not working for free, because that opportunity cost is bundled into average total cost. The firm still books accounting profit, just no surplus beyond what the next best use of the same capital would have returned, which is precisely what the regulation aims for.
Formula / Example
This is the live Monopoly sandbox. Drag the curves, or open the full version.
Related terms
Common comparisons
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