2.1 Microeconomics & Macroeconomics
Microeconomics: study of particular markets & sections of economy
- Individual firms, consumers, & markets making individual decisions within the economy
- g. effect of a price change on the demand/supply of a good
Macroeconomics: study of economic behavior & decision making in whole economy
- Aggregates (total supply/demand for g/s in an economy at a particular time)
- g. level of inflation, national spending, national output, economic development etc.
- Decisions are made by government in managing the economy as a whole
2.2 The role of markets in allocating resources
Resource allocation – the way in which markets decide what goods & services to provide, how to produce them & who to produce them for
Price mechanism
- Prices respond to shortages & surpluses
- Price rises: consumers ration
- Reduces amount they are willing/able to buy
- Tells producers there is excess supply in the market
- Gives suppliers incentive to decrease supply
- Shortages causes price to rise
- Surpluses causes prices to fall
Market system – method of allocating resources through market forces of demand & supply
- Goods are bought/sold in a market at an equilibrium price
- Producers produce goods that consumers demand the most
Market equilibrium
- Demand = supply for a good
- Demand changes e.g. ↑income: people can afford more goods
- Supply changes e.g. weather impacts supply (drought) = ↓ crops)
- Market is more likely to be in state of disequilibrium than equilibrium
- Demand & supply constantly change
Economic questions
- What to produce
- How to produce
- For whom to produce
Price mechanism – system of relying on market force of demand & supply to allocate resources
2.3 Demand
Demand – the willingness and ability to buy a product
Effective demand: willingness to buy is backed by the ability to pay for the purchase
Quantity demand: effective demand for a particular goods
- E. g. Want a phone but don’t have the money to buy (demand)
- Have the money to buy (effective demand)
Individual demand: demand from one customer
Market demand: total (aggregate) demand; sum of all individual demands of consumers
Demand curve – shows effective demand
Law of demand
- Increased price = decreased demand
- Decreased price = increased demand
Slopes down from left to right
- Demand increases as price falls (vice versa)
Movements are due to change in price
- Price rise = contraction along demand curve (less demand)
- Price falls = extension along demand curve (more demand)
Reasons for shifts
- Consumer incomes
- Increased income = people can afford more e.g. bicycle replaced by motorcycle
- Tax on incomes (more/less disposable income)
- Rise/fall in the price of substitute (eg. tea & coffee)
- Rise in the price of complements (eg. printers & ink cartridge)
Two products used/consumed together
As demand for 1 product increases, demand for other product increases
- Successful/unsuccessful advertising
- Weather
- Legislation
- Age distribution
- Fashion/trends
- Demand varies depending on age group
- g. trainers are more popular amongst young people
Majority of population is young people = high demand
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↓ price (80 to 60) = ↑ demand (300 to 500)
↑ price (60 to 80) = ↓ in demand (500 to 300)
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↑ demand (500 to 600)
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↓ demand (500 to 400) without change in price
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2.4 Supply
Supply – the willingness of producers to supply a good or services at a given price
Quality supplied: amount of goods producers are willing to make & supply
Market supply: amount of goods all producers supplying the product are willing to supply
Supply curve
Law of supply
- Increased price = increased supply
- Decreased prices = decreased supply
Slopes down from right to left
- Higher supply = increase in price
Movements are due to change in price
- Increase in price = extension in supply (increase in quantity supplied)
- Decrease in price = contraction in supply (reduced quantity supplied)
Reasons for shifts
- Change in costs of production (COP)
Producers can produce & supply products cheaply
COP rises = supply falls
- Changes in quantity of resources available
Resources rise = supply rises (vice versa)
- Technological changes (higher productivity/output)
- Profitability of other products
Producers might shift to producing more profitable products (reduces supply of initial product)
- Joint supply – when a product is made as a by-product of another
- Weather
- Regulation/bureaucracy
- Increased number of producers in the market
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↑ price (60 to 80) = ↑ supply (500 to 700)
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↑ supply without change in price (S to S1) due to changes in other factors (excluding
price) ↓ supply without change in price (S to S2) due to changes in other factories (excluding price) |
2.5 Price determination
Market equilibrium: quantity demanded = quantity supplied, X shortage/surplus
Equilibrium price: price at which demand curve intersects supply curve
Equilibrium quantity: quality demanded or supplied at the equilibrium price
- Marginal benefit = marginal cost
- Movements to a new equilibrium
Increased demand (demand curve shifts right)
Increased supply (supply curve shifts right)
Market disequilibrium
Disequilibrium price: price at which market demand & supply curves don’t meet
Revenue = Price × Quantity
2.6 Price changes
Cause – change in supply/demand
Consequences
Effect on equilibrium market price | Effect on equilibrium market quantity | |
Demand shifts to the right | Increase | Increase |
Demand shifts to the left | Increase | Increase |
2.7 Price elasticity of demand (PED)
PED: responsiveness of demand to a change in price
Calculation
PED < 1 | Inelastic |
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PED > 1 | Elastic |
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PED = 0 | Perfectly inelastic | Change in price X effect quantity demanded | ![]() |
PED = ∞ | Perfectly elastic | Change in price leads to 0 quantity demanded | ![]() |
PED = 1 | Unitary | %△ quantity demanded = %△ price | ![]() |
Determinants of PED
- Availability of close substitutes – ↑substitutes → products easily replace if ↑price → elastic
- Proportion of income spent on products – ↑income, △price X matter → inelastic
- Cost of substituting between products – ↑substitution cost → inelastic
- Brand loyalty / habit – less sensitive to △price → inelastic
- Advertisement – ↓PED → inelastic
- Necessity – essential → inelastic, luxury → elastic
- Durability – non-durable → inelastic, durable → elastic
- Time – takes time for consumers to change habits → long run → elastic
Significance of PED
Firms | Gov |
(Charge different customers different price of same product coz differences in PED)
But – Difficult to calculate accurately as PED changes constantly |
Decide products to impose taxes (usually on inelastic products)
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2.8 Price elasticity of supply (PES)
PES: responsiveness of supplied to a change in price
Calculation
PES < 1 | Inelastic | Supply unresponsive to changes in price | ![]() |
PES > 1 | Elastic | Supply responsive to changes in price | ![]() |
PES = 0 | Perfectly inelastic | Change in price X effect quantity supplie | ![]() |
PES = ∞ | Perfectly elastic | Change in price leads to 0 quantity supplied | ![]() |
PES = 1 | Unitary | %△ quantity supplied = %△ price | ![]() |
Determinants of PES
- Spare capacity – if has spare capacity, can ↑supply → elastic
- Level of stock – ↑stock ↑elastic
- No of firms in industry – ↑no of firms ↑elastic
- Ease & cost of factor substitution – if capital / labour occupationally mobile → elastic
coz resources can be mobilized to supply extra output
5. Time period & production speed – long time, firm adjust production level → elastic
Significance of PES
Firms | Gov |
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2.9 Market economic system
Types
- Free market economy eg Hong Kong
- Relies on market forces of demand & supply in private sector to allocate resources with minimal gov intervention
Adv | Dis |
→ stimulate innovation, ↑efficiency
Producers & consumers choose what to produce / consume |
E.g. use non-renewable resources → pollution |
2. Planned economy eg North Korea
- Relies on gov in public sector allocating resources
3. Mixed economy eg Japan
- Combination of free market & planned economy
- Changes in demand & supply changes price & quantity
- Allocation of resources is determined by profit motive
Adv | Dis |
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How gov solve market failure?
Solution | Definition | Graph | Adv | Dis |
Maximum price | Gov sets price below equilibrium price | ![]() |
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Minimum price | Gov sets price above equilibrium price | ![]() |
→ enable plan investment & output
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Indirect taxation | Aim to ↓ demand for demerit goods | ![]() |
↓ demand
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Great impact on low income earners |
Subsidies | Payment by gov | ![]() |
↓production cost |
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Regulations | eg – complete ban
– age limit |
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eg fake ID cards |
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Privatisation | Transfer ownership of assets from public to private sector |
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Nationalisation | Purchase of private sector assets by gov |
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Large oppo cost | |
Direct provision | eg – education
– healthcare |
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2.10 Market failure
Market failure – occurs when market force are unsuccessful in allocating resources efficiently
Private costs: direct costs of production & consumption of a individual, firm or gov
Eg (pro) wages, (con) price paid for goods by conusmers
External costs: -ve side-effects of production & consumption incurred by 3rd parties for which
no compensation is paid
Eg (pro) air, (con) passive smoking
Social costs: private costs + external costs
Private benefit: benefits of production & consumption enjoyed by a individual, firm or gov
Eg To producer – profit received
To consumer – satisfaction gained
External benefit: +ve side effects of production & consumption experienced by 3rd parties for
which no money is paid
Eg vaccination protect surrounding ppl
Social benefits: private benefits + external benefits
Types of market failure | Definition / Cause | Example | Gov solution |
1.Public goods
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non-rivalrous
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Street lighting | Tax |
2.Merit goods |
+ve spillover effects in economy |
Education | Subsidy |
3.Demerit goods |
-ve spillover effects in economy
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Cigarettes | Tax
Banning |
4.Monopoly |
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Attract foreign firms
→↑competition |
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5. Geographical immobility | Provide public housing & transport | ||
6. Occupational Occupational immobility | Provide more training | ||
7. Information failure | Good where ppl unaware of long-term effects | Chocolate | Education |
2.11 Mixed economic system
Mixed economy
- Decisions are made by a combination of the govt & the private sector (market)
- USA, India, China, Singapore, Japan etc.