Why does price exceed marginal cost in a monopoly?
Robert Miller
Updated on February 09, 2026
The inefficiency of monopoly In a competitive equilibrium price is equal to marginal cost; if more output were produced, marginal cost would exceed price. Thus the “gains from trade” are fully realized: no more units can be sold at a price that covers MC. Price exceeds MC.
What happens when price exceeds marginal cost?
In perfectly competitive markets, firms decide the quantity to be produced based on marginal costs and sale price. If the sale price is higher than the marginal cost, then they produce the unit and supply it. If the marginal cost is higher than the price, it would not be profitable to produce it.
What happens if marginal cost increases in a monopoly?
A monopolist can determine its profit-maximizing price and quantity by analyzing the marginal revenue and marginal costs of producing an extra unit. If the marginal revenue exceeds the marginal cost, then the firm can increase profit by producing one more unit of output.
What happens when marginal cost exceeds marginal revenue?
If a firm is producing at a level where marginal revenue is greater than marginal cost, then by producing one more unit the firm can gain more revenue than it loses in cost and thereby makes a marginal profit. This means that the firm is losing profit with each additional unit of output and it should produce less.
Should price be greater than marginal cost?
Your marginal cost should always be lower than your price per unit. If the cost of materials and production rises beyond the realistic value of the unit, then steps must be taken to reduce the overall production cost. The retail price should be based on marginal cost plus the per-unit cost of shipping and marketing.
Is price greater than marginal cost?
In a perfectly competitive market, price equals marginal cost and firms earn an economic profit of zero. In a monopoly, the price is set above marginal cost and the firm earns a positive economic profit. Perfect competition produces an equilibrium in which the price and quantity of a good is economically efficient.
Can marginal cost be a straight line?
If the average cost of producing a good is constant, a firm’s marginal cost can also be constant if it is equal to average cost, both of which would be represented horizontally on a linear graph. Marginal costs are constant when production costs are constant.
What if marginal revenue is greater than marginal cost?
If the marginal revenue is greater than the marginal cost, then the marginal profit is positive and a greater quantity of the good should be produced. Likewise, if the marginal revenue is less than the marginal cost, the marginal profit is negative and a lesser quantity of the good should be produced.
Which is the maximum price for a monopoly?
First, since social welfare is maximum when price of a commodity is fixed at the level where it equals marginal cost of production of the commodity, it is proposed that the maximum price for the monopoly should be fixed equal to the marginal cost. This is therefore known as marginal cost pricing.
How is marginal revenue and marginal cost determined in a monopoly?
Indeed, the monopoly could seek out the profit-maximizing level of output by increasing quantity by a small amount, calculating marginal revenue and marginal cost, and then either increasing output as long as marginal revenue exceeds marginal cost or reducing output if marginal cost exceeds marginal revenue.
What happens to firms under pure competition and monopoly?
In this unit, we shall analyse the behaviour of a firm under two different market structures, namely, pure/perfect competition and monopoly. The crucial parameter is the size of the constituent firms in relation to the total industry’s output. Throughout this unit, we go by the assumption that the firms are guided by profit maximisation.
How does a monopolist gain or lose revenue?
When a monopolist increases sales by one unit, it gains some marginal revenue from selling that extra unit, but also loses some marginal revenue because every other unit must now be sold at a lower price.