7: Market Structures in Agriculture

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Learning Objectives

This chapter is about competition and market outcomes under these different market structures. The specific learning objectives for the chapter are as follows:

Describe and explain characteristics of different market structures on the selling side of the market.
Use the MR = MC profit maximizing condition to find profit maximizing solutions under different market structures.
Explain the strategic interactions in duopoly models, distinguish between Cournot and Bertrand models of duopoly, and explain how each is an example of the prisoners’ dilemma
Explain the folk theorem and the ability of firms to avoid prisoners’ dilemma outcomes in price competition over time.
Understand the economic welfare implications of imperfectly competitive market structures relative to the perfectly competitive benchmark.

Markets vary in ways that affect competition and pricing. In some markets, competition is fierce. In others, it is light. Some firms have broad discretion in setting prices, while others face take-it-or-leave-it market prices. Pricing and competition depend on the structural characteristics of the market. Economists classify markets as monopolies, oligopolies, monopolistically competitive, or perfectly competitive depending on the characteristics of selling firms in the market. A brief overview of each market structure is as follows:

A monopoly is a market with only one seller. The seller (called a monopolist) will often have quite a bit of control over the price that it charges. Earlier in the course, you examined a firm that was a price taker. A monopolist is not a price taker. As the only seller, the monopolist has an incentive to keep its price above its marginal cost. In so doing, it takes surplus from consumers and turns that surplus into profits for itself. Naturally, sellers like to have monopoly power. The problem for the monopolist is to get as much of the consumer surplus as it can. This problem is complicated in that the monopolist faces the market demand curve. Because of the law of demand, the monopolist must lower its price if it wants to sell more, which entails sacrificing its profit margin. On the other hand, if the monopolist attempts to raise price, and thereby increase its profit margin, it sacrifices volume. There is a balancing act here that you have seen before with demand elasticities in Chapter 3. In this chapter, you will see that the demand elasticity facing the monopolist is relevant and can help you solve the monopolist’s problem.

An oligopoly is a market where there are a few sellers. There must be at least two sellers (a duopoly), and there is no magic number on what constitutes the upper limit of a “few” sellers. Like monopolists, oligopolists do have some discretion in setting their prices. However, the problem is further complicated by the fact that the oligopolist must pay attention to the actions of its competitors. Interactions among competitors are of primary interest in oligopoly models.

Monopolistic competition refers to situations where there are generally many sellers (again, there is no magic number that divides “few sellers” from “many sellers”). A key feature of monopolistic competition is that products are differentiated in the minds of consumers and/or transactions costs give rise to varied perceptions among consumers as to the advantages or disadvantages of patronizing one firm over another. Because products are differentiated, sellers are not price takers. Like the monopolist, firms in monopolistic competition face a downward sloping demand curve. In fact, you will see that the individual firm’s problem in monopolistic competition has the same set-up as the monopolist’s problem.

Perfect competition refers to situations where there are many sellers. Products are homogeneous or differ only in ways that readily apparent to all buyers. The actions of any single seller has no effect on the market price. Firms under perfect competition are price takers. The price taking assumption was introduced earlier in Chapter 2. This assumption is the one key feature of perfect competition. While the market demand curve slopes downward, the firm does not face the market demand curve; it only sees the prevailing market price. It can sell all that it wants (or all that it can produce) at the going market price. If the firm attempts to raise its price, there are no buyers. For this reason, it can be said that the firm faces an elasticity of demand that is negative infinity.

7.1: Considerations in Classifying a Market
This page discusses how to classify market structures—monopoly, oligopoly, monopolistically competitive, and perfectly competitive—by defining market boundaries of product, time, and place. It highlights the significance of the number and nature of firms in these classifications, with monopolies having one firm and oligopolies a few. Product differentiation and entry barriers, like economies of scale, are also important factors.
7.2: Market Structures
Perfect competition is on one end of the market structure spectrum, with numerous firms. Monopoly is the other extreme of the market structure spectrum, with a single firm. Monopolies have monopoly power, or the ability to change the price of the good. Monopoly power is also called market power, and is measured by the Lerner Index. This chapter defines and describes two intermediary market structures: monopolistic competition and oligopoly.
7.3: Marginal Revenue for Imperfectly Competitive Markets
This page discusses profit maximization in imperfectly competitive markets, establishing that it occurs where marginal revenue (MR) equals marginal cost (MC), contrasting this with perfect competition where MR equals price (P). It examines the relationship between MR and demand elasticity, highlighting the impact of linear demand curves on MR. The content uses contradiction to reinforce these concepts.
7.4: Monopolistic Competition
Monopolistic competition is a market structure defined by free entry and exit, like competition, and differentiated products, like monopoly. Differentiated products provide each firm with some market power. Advertising and marketing of each individual product provide uniqueness that causes the demand curve of each good to be downward sloping. Free entry indicates that each firm competes with other firms and profits are equal to zero on long run equilibrium.
7.5: Profit Maximization for a Monopolist or Monopolistically Competitive Firm
This page outlines the profit-maximizing strategy for monopolists using the inverse demand curve $P = 100 - 3Q$ and its marginal revenue $MR = 100 - 6Q$. It illustrates that the optimal output and price are 10 units and $70, respectively. It warns that incorrect quantity settings can reduce profits.
7.6: Oligopoly Models
Oligopoly is a market structure with few firms and barriers to entry. There is often a high level of competition between firms, as each firm makes decisions on prices, quantities, and advertising to maximize profits. Since there are a small number of firms in an oligopoly, each firm’s profit level depends not only on the firm’s own decisions, but also on the decisions of the other firms in the oligopolistic industry.
7.7: Profit Maximization in an Oligopoly
This page covers oligopoly concepts, focusing on duopoly dynamics through the Cournot model where firms optimize production, resulting in Cournot Nash Equilibrium at quantities of 30 and a price of $80. It discusses the inefficiency of this outcome compared to monopolistic scenarios and the prisoners' dilemma of potential collusion.
7.8: Oligopoly, Collusion, and Game Theory
Collusion occurs when oligopoly firms make joint decisions, and act as if they were a single firm. Collusion requires an agreement, either explicit or implicit, between cooperating firms to restrict output and achieve the monopoly price. This causes the firms to be interdependent, as the profit levels of each firm depend on the firm’s own decisions and the decisions of all other firms in the industry. This strategic interdependence is the foundation of game theory.
7.9: Concluding Comments- Effects of Imperfect Competition on Economic Welfare
This page examines the welfare effects of imperfectly competitive markets like monopolies and oligopolies, where sellers can exploit consumers, resulting in reduced production, increased prices, and dead-weight loss. It emphasizes the necessity of antitrust laws to foster competition and enhance economic welfare by maximizing total surplus. Examples of a merger analysis and a price-fixing case in agriculture illustrate the critical role of regulatory oversight in ensuring market competitiveness.
7.10: References
7.11: Problem Sets
This page offers exercises on profit maximization for monopolists and firms in Cournot duopolies, detailing demand equations, marginal costs, and average variable costs. It provides scenarios to calculate optimal quantities, prices, and profits, emphasizing key principles of monopolistic competition and strategic interactions.

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