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As it is well known, requirements for a firm's cost-curve under perfect competition is for the slope to move upwards after a certain amount is produced. This amount is small enough to leave a sufficiently large number of firms in the field (for any given total outputs in the industry) for the conditions of perfect competition to be preserved.
Marginal revenue under perfect competition Marginal revenue under monopoly. The marginal revenue curve is affected by the same factors as the demand curve – changes in income, changes in the prices of complements and substitutes, changes in populations, etc. [15] These factors can cause the MR curve to shift and rotate. [16]
Firms operating as monopolies or in imperfect competition face downward-sloping demand curves. To sell extra units of output, they would have to lower their output's price. Under such market conditions, marginal revenue product will not equal . This is because the firm is not able to sell output at a fixed price per unit.
Profit maximization using the total revenue and total cost curves of a perfect competitor. To obtain the profit maximizing output quantity, we start by recognizing that profit is equal to total revenue minus total cost ().
Like perfect competition, under monopolistic competition also, the companies can enter or exit freely. The companies will enter when the existing companies are making super-normal profits. With the entry of new companies, the supply would increase which would reduce the price and hence the existing companies will be left only with normal profits.
As with a perfect competitor, a monopolist’s total revenue is the total receipts it can obtain from selling goods or services to buyers. It can be written as P × Q {\displaystyle P\times Q} , which is the price of the goods multiplied by the quantity of the sold goods.
When drawing diagrams for businesses, allocative efficiency is satisfied if output is produced at the point where marginal cost is equal to average revenue. This is the case for the long-run equilibrium of perfect competition. Productive efficiency occurs when units of goods are being supplied at the lowest possible average total cost.
Therefore, increased competition reduces price and cost to the minimum of the long run average costs. At this point, price equals both the marginal cost and the average total cost for each good production. [7] [8] Once this has occurred a perfect competition exists and economic profit is no longer available. [12]