Question 1

Why does the demand curve slope downward in monopolistic competition?

Accepted Answer

In monopolistic competition, the demand curve slopes downward because firms can sell more units only by lowering prices. This reflects the negative relationship between price and quantity demanded. The curve is relatively elastic due to the availability of close substitutes, yet each firm retains some pricing power through product differentiation, allowing it to influence demand within its market segment.

Question 2

Why is marginal revenue always less than price in monopolistic competition?

Accepted Answer

Marginal revenue is less than price because to sell additional units, a firm must lower the price on all units sold, not just the new ones. While the firm gains revenue from the extra unit at the lower price, it loses revenue on previous units that could have sold at the higher price. This revenue loss causes the marginal revenue curve to lie below the average revenue (demand) curve.

Question 3

What does the U-shaped marginal cost curve represent in monopolistic competition?

Accepted Answer

The U-shaped marginal cost curve reflects the law of diminishing returns. Initially, marginal cost decreases as production increases due to efficiency gains. However, as output expands further, the cost of producing each additional unit rises, causing the curve to increase. This pattern shows how production efficiency changes across different output levels.

Question 4

How do MR and MC curves determine pricing and production decisions?

Accepted Answer

Firms use the marginal revenue and marginal cost curves together to make pricing and production decisions. The intersection of these curves indicates the profit-maximizing output level. The demand curve then determines the price at that quantity. This framework helps firms balance revenue gains against production costs to optimize profitability.

Question 5

How does the coffee shop example illustrate the relationship between MR and AR?

Accepted Answer

A coffee shop lowering prices to attract customers demonstrates why marginal revenue falls below average revenue. To sell more cups, the shop must reduce the price on all cups, not just additional ones. The revenue gained from extra sales is offset by lower revenue on previously sold cups, making marginal revenue less than the price per cup.

Question 6

What role does product differentiation play in a firm's demand curve?

Accepted Answer

Product differentiation allows each firm to face its own downward-sloping demand curve and retain some pricing power. Through successful differentiation or advertising, firms can shift their demand curves outward, enabling them to sell more at existing prices or maintain sales despite price increases, distinguishing them from competitors.

Question 7

Why do firms in monopolistic competition operate with excess capacity in the long run?

Accepted Answer

Firms in monopolistic competition operate with excess capacity because they cannot produce at the minimum point of their average cost curve while maintaining long-run equilibrium. The interaction of downward-sloping demand, marginal revenue below price, and competitive entry limits their ability to fully utilize production capacity, resulting in inefficiency.

MR, MC i krzywa popytu w warunkach konkurencji monopolistycznej

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