Please enable JavaScript.
Coggle requires JavaScript to display documents.
Theme 3, . - Coggle Diagram
Theme 3
Market Structures
N-Firm Concentration Ratios
An N-firm concentration ratio measures how much market share the N largest firms in a market have.
E.g. a 3 -firm concentration ratio measures how much market share the 3 largest firms in a market have.
Monopoly
When there’s only one dominant firm in a market. Legally, a monopoly is a firm with over 25% market share.
E.g. Microsoft, who owned 90% of the operating system market.
Assumptions
- There’s only one firm in the market
- The monopoly will want to profit maximise .
- High barriers to entry .
Monopoly Diagram
Just a regular costs and revenue diagram:
Natural Monopoly
Natural monopoly
A natural monopoly is when it’s naturally most efficient if only one firm is in the market.
-
Natural monopoly diagram
Price discrimination
Price discrimination is when a firm charges different groups of consumers different prices, for the same good.
E.g. students get lower prices for train tickets than adults.
Conditions
-
information on elasticities
The firm must be able to identify which consumers are elastic and which are inelastic.
limit reselling
The firm must be able to limit reselling: it must be able to limit elastic consumers from selling cheap tickets to inelastic consumers
E.g. trains require student IDs or student Oysters, to stop inelastic adult consumers using resold student tickets!
Price discrimination diagram
- Elastic demand is flatter.
- Inelastic demand is steeper.
- And total demand juts out at lower prices, because elastic consumers join the market.
Perfect Competition
- Many small buyers and sellers
- No barriers to entry or exit
- Homogeneous products
- Perfect information
Perfect competition diagram
Monopolistic competition
- There are many small buyers and sellers
- Low barriers to entry or exit
- Differentiated goods
Monopolistic competition
Oligopoly
- The market is dominated by a few large sellers
- High barriers to entry/exit
- Differentiated goods
- Interdependence between firms
-
Price competition
Price wars
When firms undercut each other with lower prices to steal the other firms’ consumers.
E.g. baked bean wars, when supermarkets undercut each other and drove the price of baked beans down to just 3p
Predatory pricing
When a firm aggressively cuts its prices below AVC to force out competitors from the market.
Short run: firm incurs a loss
Long run: firm forces out its competitors, so they can take over the market.
Limit pricing
When an incumbent firm uses its economies of scale to set a price low enough to limit new firms from entering.
Small new firms, without economies of scale, won’t be able to compete so they’ll stay out of the market.
Limit pricing is a barrier to entry.
Non-price competition
- advertising
- loyalty cards
- branding
- quality
-
-
Efficiency
Productive efficiency
When a firm is producing at its lowest average cost, where MC = AC.
Allocative efficiency
When welfare is maximised, where MC = AR.
X-inefficiency
When a firm is producing above its average cost curve for a given level of output.
Dynamic efficiency
Dynamic efficiency is how changing technology improves a firm's output potential over time.
Revenue, Costs & Profits
Revenue
Total Revenue (TR)
Total Revenue = Price x Quantity
TR = P x Q
Total revenue is total amount of money a firm receives from its sales.
Marginal Revenue (MR) and Total Revenue (TR) relationship
When MR is positive, TR will increase as quantity increases.
When MR is negative, TR will decrease as quantity increases.
Total Revenue (TR) curve
Revenue maximisation - A firm’s total revenue is maximised when MR = 0 (no more revenue can be gained at this point).
Average Revenue (AR)
AR = TR/Q
If we simplify this formula, we find that Average Revenue = Price (AR = P)
Average Revenue Curve
Marginal Revenue (MR)
MR = ∆TR/∆Q
Marginal revenue is the additional revenue from selling one extra unit.
Marginal Revenue (MR) curveThe MR curve must:
- Start at the same point as AR
- Cross the Q axis at half the quantity AR crosses at
- MR should end at the same quantity that AR ends at
Important Fact about the MR curve
- As price decreases and quantity increases, MR decreases.
- MR decreases from positive to negative.
-
-
-
-
-
-
-
-