Market Structures & Competition
Market structure describes the degree of competition among firms in an industry, ranging from competitive markets with many buyers and sellers to monopolies dominated by a single supplier. The structure of a market determines price levels, profit margins, product quality, and consumer choice.
- Oligopoly
- A market structure dominated by a small number of large firms that are interdependent.
- Barriers to Entry
- Obstacles that make it difficult for new firms to enter a market (e.g., high startup costs, patents).
- Economies of Scale
- The cost advantage a firm gains by increasing production, leading to a fall in average costs.
Market Structures & Competition: Supply, Demand, Elasticity & Welfare Shift Lab
Trigger a market shock or adjust price elasticity below to watch the curves shift and inspect the new equilibrium price, output, and welfare triangles.
Baseline Free-Market Equilibrium
Market clears at P₁, Q₁ where Quantity Demanded equals Quantity Supplied (allocative efficiency; social welfare is maximised).
Key Concepts & Exam Definitions (5)
- Oligopoly
- A market structure dominated by a small number of large firms that are interdependent.
- Barriers to Entry
- Obstacles that make it difficult for new firms to enter a market (e.g., high startup costs, patents).
- Economies of Scale
- The cost advantage a firm gains by increasing production, leading to a fall in average costs.
- Product Differentiation
- Making a product slightly different from competitors to increase brand loyalty and reduce price elasticity.
- Price Competition
- Firms trying to win customers by offering lower prices than their rivals.
Quick-Fire Flashcards (5)
Click any card to check the answer, then mark it as Known to track your progress.
What term describes a market with only one seller?
What is the name for firms in an oligopoly illegally agreeing to fix prices?
In a highly competitive market, who decides the price?
Give an example of a barrier to entry.
What happens to average costs when economies of scale occur?
Exam-Style Questions & Mark Schemes (3)
Write or think through your answer first, then click Check Mark Scheme to see the exact points examiners award marks for.
- Q1
Explain how economies of scale act as a barrier to entry.
Click “Check Mark Scheme” to compare your answer, Large existing firms have low average costs due to economies of scale. New entrants cannot produce enough to reach these low costs, making it hard to compete on price.
- Q2
Give two ways a firm might compete on factors other than price (non-price competition).
Click “Check Mark Scheme” to compare your answer, Advertising/branding, improving product quality, or offering better customer service.
- Q3
Why might an oligopolistic market lead to stable prices?
Click “Check Mark Scheme” to compare your answer, Firms are interdependent; if one raises prices, they lose customers. If one lowers prices, others copy, sparking a price war where all lose profit. So, they often keep prices stable.
Common Exam Questions (3)
What is a competitive market?
A competitive market is one with many buyers and sellers offering similar products and low barriers to entry, so no individual firm has the market power to raise prices above the market equilibrium without losing customers.
What makes a monopoly?
A pure monopoly exists when a single firm is the sole seller in a market (100% market share). Under UK competition law, a firm has a legal (working) monopoly if it holds 25% or more of the market share.
Why are monopolies considered bad for consumers?
Without competition, a monopoly can restrict output to charge higher prices (reducing consumer surplus), has less incentive to improve customer service or product quality, and may become productively inefficient, although large monopolies may benefit from economies of scale.
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Related study guides
Government Intervention in Markets
Market failure occurs when the free market price mechanism fails to allocate scarce resources efficiently, resulting in overconsumption of demerit goods, underconsumption of merit goods, or missing public goods. Governments intervene using indirect taxes, subsidies, regulation, and state provision to correct these externalities.
Supply and Demand
The supply and demand model explains how prices and quantities are determined in a competitive market. Demand shows the quantity buyers are willing and able to purchase at each price, supply shows the quantity firms are willing and able to offer, and the intersection of the two curves establishes the market equilibrium price and quantity.