3.4 market structures Flashcards
What are the 4 market structure arranged from most competitive to least competitive (number of sellers)
1) Perfect competition (high competition)
2) Monopolistic competition
3) Oligopoly
4) Monopoly (no competition)
What are the types of efficiency
- allocative efficiency
- productive efficiency
- dynamic efficiency
- X-inefficiency
What is allocative efficiency
- Producing at a point where the price of a good is equal to the marginal cost of production (P = MC)
- This maximises welfare because the price charged for the last unit = the cost of making the last unit, so the net welfare falls if any more is produced
- This happens in a perfectly competitive market because the price mechanism ensures that producers supply exactly what consumers demand
What is productive efficiency
Occurs at the lowest cost per unit output or the lowest point of the average cost curve (where the MC curve = AC curve)
What is dynamic efficiency
Dynamic efficiency is about improving efficiency in the long term, so it refers to the willingness and eagerness of firms:
* to carry out research and development to improve existing products or develop new ones.
* to invest in new technology or training to improve the production process and reduce production costs.
What is X inefficiency and how is it caused
X-efficiency measures how successfully a firm keeps its costs down. X-inefficiency means that production costs could be reduced at that level of production. X-inefficiency can be caused by:
1. either using factors of production in a wasteful way (e.g. by employing more people than necessary),
2. or paying too much for factors of production (e.g. paying workers more than is needed or buying raw materials at higher prices than necessary).
What is the N-firm concentration ratio?
Some industries are dominated by just a few companies (e.g. Boeing and Airbus planes). These are called concentrated markets.
How can the n-firm concentration ratio be used to calculate the level of domination of a market
The level of domination is measured by a concentration ratio.
* Suppose 3 firms control 90% of the market, while another 40 firms control the other 10%.
* The 3-firm concentration ratio would be 90% (i.e. the 3largest firms control 90% of the market).
* It’s easy to calculate the n-firm concentration ratio of a market. For example, suppose a market is worth £45m and you wanted to find the 3-firm concentration ratio. If the biggest 3 firms have revenues of £15m, £9m & £7m respectively, the 3-firm concentration ratio is: (15 + 9 + 7)/45 × 100 = 68.9%
What would be the n-firm concentration ratio for monopolies, oligopolies, monopolistically competitive and perfectly competitive markets
Monopoly - 1 firm has 100% of the market share
Oligopolies - five or fewer firms control 50% of the market share
Monopolistically competitive market - a low concentration ratio, mainly small firms
Perfectly competitive - very low concentration ratio, many small firms
What are the characteristics of a perfectly competitive (theoretical) market
- There’s an many suppliers & consumers
- Producers and Consumers have perfect information of market conditions
- Products are homogeneous (identical) - so demand curve is horizontal
- There are no barriers of entry or exit (join and leave easily)
- Firms are profit maximisers (MC = MR)
- All prices set by the price mechanism (firms are price takers)
What are the assumptions for a perfectly competitive market e.g. Agricultural markets (3)
The conditions for a perfectly competitive market ensure that the rationing, signalling and incentive functions of the price mechanism work perfectly. In particular:
* all firms are price takers (‘the market’ sets the price according to consumers’ preferences, rationing resources and signalling priorities),
* consumers and producers have perfect knowledge of the market, and there are no barriers to entry or exit.
* Perfectly competitive markets will achieve allocative efficiency, assuming that there are no externalities (where the S curve intersects with D curve) - so welfare is maximised
What happens to supernormal profits (short run) in perfectly competitive markets
- In perfect competition, no firm will make supernormal profits in the long run.
- This is because any short-term supernormal profits (PP1QA) attract new firms to the market (since there are no barriers to entry). This means supernormal profits are ‘competed away’ in the long term — i.e. supply increases, industry supply curve shifts right, so price falls from P to P1 and profits too as firms are forced to lower prices to P1Q1.
Why may a firm leave a perfectly competitive market
A firm will leave a market if it’s unable to make a profit in the Long Run:
* If the market price (AR) falls below a firm’s average unit-cost (AC), the firm is making less than normal profit (i.e. a loss).
* There are no barriers to exit in a perfectly competitive market, so in the LONG RUN the firm will just leave the market.
How does perfect competition lead to productive efficiency
Productive efficiency is about ensuring the costs of production are as low as they can be. This will mean that prices to consumers can be low as well.
In perfect competition, productive efficiency comes about as a direct result of all firms trying to maximise their profits.
At the long run equilibrium of perfect competition, a firm will produce a quantity of goods such that:
marginal revenue (MR) = marginal costs (MC)
* Output above this level (MC > MR) reduces profit, so firms wouldn’t produce it.
* Output below this level (i.e. MR > MC) would mean the firm would earn more revenue from extra output than it would spend in costs — so the firm would expand output as this would increase profit.
Why are firms in perfectly competitive market productively efficient
In a perfectly competitive market, the long run output level is at the bottom of the average-cost (AC) curve — i.e. at the lowest possible cost level. In other words, firms in a perfectly competitive market will be productively efficient.
Having to compete gives firms a strong incentive to reduce waste and inefficiency (X inefficiency) - or they may be forced to leave the market.
(ASSUMING THERE IS NO ECONOMIES OF SCALE - because firms are too small)
Why is there no dynamic efficiency in perfectly competitive markets
1) Dynamic efficiency is about improving efficiency in the long term, so it refers to the willingness and eagerness of firms:
a) to carry out R & D to improve existing products or develop new ones.
b) to invest in new technology or training to improve the production process & reduce production costs.
However, these strategies involve considerable investment and therefore risk, so they will only take place if there’s adequate reward.
However, Firms in a perfectly competitive market earn only normal profit, so there’s no reward for taking risks. This means dynamic efficiencies will not be achieved.
How does perfectly competitive markets lead to static (allocative and productive efficiency) in the long run?
1) If allocative and productive efficiency are achieved at any particular point in time, this is called static efficiency. But static efficiency can’t last forever, since technology and consumer tastes change. For example, the methods used to make cars in the 1920s might have been allocatively and productively efficient at the time, but they’d be hopelessly out of date now.
2) To remain allocatively and productively efficient, car makers would have needed to invest in new production technology & design new models.
Why may governments want to encourage competition
By encouraging competition, governments hope to achieve these same kinds of efficiencies in real life. For example, governments want to make sure firms:
(i) are forced to produce efficiently, reducing costs where possible,
(ii) set prices at a level that’s fair to consumers
How can a government increase competition
- Encourage new enterprises with advice and start-up subsidies.
- Increase consumer knowledge by ensuring that comparison information is available.
- Privatise and deregulate large monopolistic nationalised industries.
- Discourage mergers and takeovers which might excessively reduce the number of competing firms.
- Encourage more international competition — e.g. by joining the EU, countries enter into a multinational ‘single market’.
What are the characteristics of monopolistic competition markets
- large number of buyers and sellers
- Few barriers of entry and it is easy for firms to recoup their capital expenditure on exit
- Consumers face a wide choice of differentiated products (- so demand curve slopes down) Each firm has a slight degree of monopoly power in controlling the quality and physical differences between products
- Firms have some influence on price so are price makers
What are the types of differences in products in markets that are monopolistically competitive (3)
- physical - product features
- marketing - advertising, packaging
- distribution - shop, online, telephone
This helps firms differentiate their products so they can retain their price-making power to make supernormal profits
What is the profit maximising equilibrium in the SHORT RUN in monopolistically competitive markets
In monopolistic competition, the barriers to entry and/or the product differentiation mean that supernormal profits can be made, but only in the short run.
* The profit-maximising level of output occurs where MC = MR.
* The diagram shows the output leading to the profit-maximising price (P).
* This means the firm earns supernormal profit of the blue shaded region
What is the profit maximising equilibrium in the LONG RUN in monopolistically competitive markets
1) In monopolistic competition, the barriers to entry are fairly low and knowledge is perfect, so new entrants will join the industry. These new entrants will cause the established firm’s demand (AR) curve to shift to the left (compete away demand)
2) New entrants will continue to join (and the established firm’s demand curve will continue to shift left) until:
* Only normal profit can be earned — this is where P = AR = AC. At this point the slopes of the AC curve and the demand (or AR) curve touch tangentially. This is shown by the red dot.
* At this quantity, MR = MC
Why are firms in a monopolistically competitive market not productively or allocatively efficient
Since the firm is not producing at the lowest point on the AC curve, this outcome is not productively efficient.
And since the equilibrium price is greater than and not equal to MC, this is not allocatively efficient.
(But despite this, it still achieves greater efficiency levels than a monopoly market