One handout per topic, in plain English. Read the handout before the textbook, not after it — each one takes about five minutes and is designed to make the idea land first, so the formal version has somewhere to stick.
11 handoutsCambridge AS & A LevelPrintableFree to copy and share
Everything in economics starts from one fact: there is not enough of anything to go round, so every choice costs something else.
Picture itYou have 200 rupees and it is lunchtime. Buying the biryani means not buying the burger. The burger you gave up is the real cost of the biryani — not the 200 rupees, but the thing you did without. That is opportunity cost, and it is the idea the whole subject is built on.
Scarcity, choice and opportunity cost
Wants are unlimited; resources — land, labour, capital, enterprise — are finite. So every economy must answer three questions: what to produce, how to produce it, and for whom. Opportunity cost is the value of the next best alternative given up, and it is the true cost of any decision.
The production possibility curve
A PPC shows the maximum combinations of two goods an economy can produce. Points inside show unemployed resources or inefficiency; points outside are unattainable now. Moving along the curve means giving up one good for the other — a picture of opportunity cost. The curve shifts outward with economic growth.
Positive and normative statements
A positive statement can in principle be tested against evidence: 'raising the minimum wage increased unemployment by 2%'. A normative statement contains a value judgement: 'the minimum wage should be raised'. Exams reward spotting which is which, because policy debate constantly mixes them.
Types of economic system
Market economies allocate by price signals; planned economies by government direction; mixed economies use both. Each answers the three questions differently, and each has characteristic failures — market economies underprovide public goods, planned economies struggle with information and incentives.
The margin is where decisions are made
Economic reasoning is about the next unit, not the total. Whether to produce one more, hire one more, or buy one more depends on marginal benefit against marginal cost, not on the average.
The bit that catches people outOpportunity cost is not the money you spend — it is the alternative you gave up. If a student turns down a job paying 50 000 a year to study, the opportunity cost of studying includes that lost income, not just the fees.
The grown-up words
What it means
What it is called
Note
Unlimited wants, limited resources
scarcity
The basic economic problem
Value of the next best alternative forgone
opportunity cost
The real cost of a choice
Curve showing maximum output combinations
production possibility curve
Illustrates opportunity cost
Statement testable against evidence
positive statement
No value judgement
Statement containing a value judgement
normative statement
Contains 'should'
Land, labour, capital, enterprise
factors of production
All are scarce
Effect of producing one more unit
marginal analysis
Decisions are made at the margin
Check you have got it
A country moves from a point inside its PPC to a point on it. What has happened?
Previously unemployed or inefficiently used resources are now being fully and efficiently employed. This is not economic growth — the curve itself has not shifted.
Is 'unemployment in Pakistan rose to 6% last year' positive or normative?
Positive — it is a factual claim that can be checked against data, whether or not it turns out to be true.
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Topic 2
The price system and the microeconomy
Nobody organises a market, and yet the right amount of bread arrives in the right shops every morning — the price does the organising.
Picture itA shortage of onions. The price rises. Buyers who wanted onions least drop out; farmers who were growing something else switch to onions. Within a season the shortage closes. No committee ordered any of it. The price carried the information and the incentive at the same time.
Demand and supply
Demand slopes down: at lower prices, more is bought. Supply slopes up: at higher prices, more is offered. Equilibrium is where they cross. A change in price causes movement along a curve; a change in anything else — income, tastes, costs, technology — shifts the whole curve.
Elasticity measures responsiveness
PED = %ΔQ demanded ÷ %ΔP. Inelastic (<1) means quantity barely responds — necessities, addictive goods, no substitutes. YED distinguishes normal from inferior goods. XED identifies substitutes (positive) from complements (negative). PES depends heavily on time.
Why elasticity matters to revenue
If demand is inelastic, raising price raises total revenue. If elastic, raising price reduces it. This single relationship explains pricing decisions, tax policy on cigarettes, and why farmers can have a good harvest and a bad year simultaneously.
Consumer and producer surplus
Consumer surplus is the gap between what buyers would have paid and what they did pay. Producer surplus is the gap between what sellers accepted and the minimum they would have. Together they measure the gain from trade — and taxes and price controls reduce them.
The functions of price
Price signals where resources are wanted, incentivises producers to supply them, and rations scarce goods among competing buyers. Any policy that fixes prices interferes with all three functions at once.
The bit that catches people outA change in price does not shift the demand curve. It moves you along it. Shifting requires a change in something other than the good's own price — and drawing this wrongly loses marks on almost every diagram question.
The grown-up words
What it means
What it is called
Note
Willingness and ability to buy at each price
demand
Slopes downward
Movement caused by a change in the good's price
movement along the curve
Not a shift
Responsiveness of quantity demanded to price
price elasticity of demand
Below 1 is inelastic
Responsiveness to a change in income
income elasticity of demand
Negative for inferior goods
Responsiveness to another good's price
cross elasticity of demand
Positive for substitutes
Gap between what buyers would pay and did pay
consumer surplus
Area under demand, above price
Signalling, incentivising, rationing
functions of the price mechanism
All three at once
Check you have got it
A 10% price rise causes a 4% fall in quantity demanded. What is PED and what happens to revenue?
PED = −4 ÷ 10 = −0.4, so demand is inelastic. Total revenue rises, because the price increase outweighs the small fall in quantity.
Give two things that would shift a demand curve to the right.
A rise in consumer income (for a normal good), a rise in the price of a substitute, a change in tastes towards the good, or a rise in population.
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Topic 3
Government microeconomic intervention
Markets sometimes get the answer wrong — and governments intervening to fix it sometimes make it worse.
Picture itA factory produces cheaply and sells cheaply, and the river downstream is poisoned. The price of the product never included the cost of the river, so too much was produced. That gap between private cost and social cost is market failure, and closing it is what this topic is about.
Externalities
A cost or benefit falling on a third party. Negative production externalities (pollution) mean social cost exceeds private cost, so the market overproduces. Positive consumption externalities (vaccination, education) mean social benefit exceeds private benefit, so the market underproduces.
Public goods and information failure
Public goods are non-rival and non-excludable, so the free rider problem means no private firm will supply them — street lighting, national defence. Merit goods are underconsumed because people undervalue the benefit; demerit goods are overconsumed for the mirror reason.
Policy tools
Indirect taxes internalise external costs. Subsidies encourage positive externalities. Regulation bans or limits directly. Tradable permits cap total pollution and let the market allocate it. Price ceilings (below equilibrium) cause shortages; price floors (above) cause surpluses.
Direct and indirect taxes
Direct taxes are on income and wealth and can be progressive. Indirect taxes are on spending and tend to be regressive, taking a larger share of a poor person's income. Who actually bears an indirect tax — the incidence — depends on the relative elasticities of demand and supply.
Government failure
Intervention can fail through poor information, unintended consequences, administrative cost, regulatory capture or political short-termism. A rent control that causes landlords to withdraw housing has made the problem worse. Evaluation marks come from taking this seriously.
The bit that catches people outThe incidence of an indirect tax falls mostly on whichever side of the market is less elastic. Tax cigarettes, and consumers pay nearly all of it because demand is inelastic — which is precisely why governments choose them.
The grown-up words
What it means
What it is called
Note
Cost or benefit falling on a third party
externality
Not reflected in the price
Private cost plus external cost
social cost
The true cost to society
Non-rival and non-excludable good
public good
Free rider problem
Good underconsumed relative to social benefit
merit good
e.g. education
Maximum legal price, set below equilibrium
price ceiling
Causes shortages
Who actually bears the burden of a tax
tax incidence
Falls on the less elastic side
Intervention leaving the outcome worse
government failure
Key evaluation point
Check you have got it
Why does a price ceiling below equilibrium cause a shortage?
At the lower price, quantity demanded rises and quantity supplied falls, so demand exceeds supply. The gap is a shortage, often filled by queues, rationing or black markets.
Why is a subsidy used for vaccination rather than a tax?
Vaccination has a positive consumption externality — it protects others too — so the free market underprovides it. A subsidy lowers the price and increases consumption towards the socially optimal level.
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Topic 4
The macroeconomy
Zoom out from individual markets and you are asking about the whole economy: total output, total spending, jobs and prices.
Picture itA single household's budget is microeconomics. The country's income and spending taken together is macroeconomics — and the surprising thing is that the two do not always behave the same way. Everyone saving more is sensible individually and can shrink the economy collectively.
Measuring the economy
GDP is the total value of output. Nominal GDP is at current prices; real GDP adjusts for inflation and is what matters for living standards. GDP per capita divides by population. GDP misses unpaid work, the informal economy, inequality and environmental damage — limits worth stating.
Aggregate demand and its components
AD = C + I + G + (X − M). Consumption is the largest part; investment the most volatile. AD slopes down because a lower price level raises real wealth, lowers interest rates and improves competitiveness abroad.
Aggregate supply
Short-run AS slopes up: higher prices with sticky wages make production more profitable. Long-run AS is vertical at full capacity in the classical view — output is determined by resources and productivity, not by the price level. It shifts with investment, technology, education and labour supply.
Inflation, deflation and unemployment
Demand-pull inflation comes from excess AD; cost-push from rising input costs. Unemployment is frictional (between jobs), structural (skills mismatch), cyclical (weak demand) or seasonal. Each type needs a different policy, which is why diagnosis matters.
The multiplier
An injection of spending raises income, part of which is spent again, and so on. The multiplier = 1 ÷ (1 − MPC), or 1 ÷ MPW. A higher propensity to save, tax or import leaks more out and gives a smaller multiplier — which is why the same stimulus works differently in different economies.
The bit that catches people outReal GDP per capita growing does not mean everyone is better off. It is an average, so it can rise while most people's incomes stagnate. Any answer about living standards should say something about distribution.
The grown-up words
What it means
What it is called
Note
Total value of a country's output
GDP
Real GDP adjusts for inflation
C + I + G + (X - M)
aggregate demand
Total planned spending
Total output firms will supply
aggregate supply
Vertical in the long run
Inflation from excess demand
demand-pull inflation
AD shifts right
Inflation from rising input costs
cost-push inflation
SRAS shifts left
Unemployment from a skills mismatch
structural unemployment
Needs retraining
Fraction of extra income that is spent
marginal propensity to consume
Determines the multiplier
Check you have got it
MPC is 0.75. What is the multiplier and the effect of a 10 bn injection?
Multiplier = 1 ÷ (1 − 0.75) = 4. A 10 bn injection eventually raises national income by about 40 bn.
Why does an economy with a high propensity to import have a smaller multiplier?
More of each round of extra spending leaks abroad rather than becoming domestic income, so fewer rounds of domestic re-spending occur.
Edvia Free Resources · Economics 9708 · Topic 4 — free to copy and share
Topic 5
Government macroeconomic intervention
Governments have two main levers — spending and taxing, and interest rates and money — and both have costs as well as effects.
Picture itTwo dials on the same machine. Turn up fiscal policy and government spends more or taxes less. Turn up monetary policy and borrowing gets cheaper. Both raise demand, both can raise inflation, and both take time to work — which is why they are so hard to use well.
Fiscal policy
Changing government spending and taxation. Expansionary fiscal policy raises AD, reducing cyclical unemployment but widening the budget deficit and possibly crowding out private investment. Contractionary policy does the reverse. The effect depends on the multiplier and on how close the economy is to capacity.
Monetary policy
Changing interest rates and the money supply, usually by a central bank. A lower interest rate reduces the cost of borrowing, raises consumption and investment, and tends to weaken the currency, helping exports. Transmission takes many months, which makes timing genuinely difficult.
Supply-side policy
Aimed at shifting LRAS right: education and training, infrastructure, deregulation, tax incentives, competition policy. Slower to work than demand-side policy but addresses structural problems that demand management cannot touch.
The four macroeconomic objectives conflict
Growth, low unemployment, low inflation and a sustainable balance of payments cannot always be pursued at once. Reducing unemployment through demand can raise inflation; raising interest rates to fight inflation can raise unemployment and worsen growth. Naming the trade-off is what earns evaluation marks.
Constraints on policy
Time lags in recognising, deciding and taking effect. Uncertainty about the multiplier. Political pressures. Debt levels limiting fiscal room. Open economies where policy leaks abroad. Policy is made under uncertainty, not from a textbook diagram.
The bit that catches people outThere is no single 'best' policy. Whether fiscal or monetary policy is preferable depends on the cause of the problem, how close the economy is to capacity, the size of existing debt and how open the economy is. An answer that names conditions will always beat one that names a favourite.
The grown-up words
What it means
What it is called
Note
Changing government spending and taxation
fiscal policy
Affects AD directly
Changing interest rates and money supply
monetary policy
Usually a central bank
Policy shifting long-run aggregate supply
supply-side policy
Slow but structural
Government borrowing reducing private investment
crowding out
Fiscal policy risk
Excess of spending over revenue in a year
budget deficit
Adds to national debt
Delay between action and effect
time lag
Makes timing difficult
Growth, jobs, stable prices, external balance
macroeconomic objectives
Often conflict
Check you have got it
Why might cutting interest rates fail to increase investment during a recession?
If firms expect weak demand, they will not invest however cheap borrowing is. Banks may also be unwilling to lend, and confidence matters more than the rate — the transmission mechanism breaks down.
Name one conflict between macroeconomic objectives and explain it.
Reducing unemployment by raising AD can push the economy towards capacity and cause demand-pull inflation, so lower unemployment is bought at the cost of higher prices.
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Topic 6
International economic issues
Countries trade because they are different, and almost every argument about trade policy is really about who bears the cost of that difference.
Picture itTwo countries, both able to make cloth and wheat. Even if one is better at both, they both gain by each doing what they give up least to produce, and trading. That is comparative advantage — counter-intuitive, two hundred years old, and still the core of the argument.
Absolute and comparative advantage
Absolute advantage: producing more with the same resources. Comparative advantage: producing at a lower opportunity cost. Trade benefits both parties when comparative advantages differ, even if one country has an absolute advantage in everything.
Protectionism and its tools
Tariffs (taxes on imports), quotas (quantity limits), subsidies to domestic producers, and non-tariff barriers such as standards and paperwork. Arguments for: infant industries, dumping, strategic industries, jobs. Arguments against: higher prices, retaliation, inefficiency, loss of consumer surplus.
The balance of payments
The current account covers trade in goods and services, income and transfers. The financial account covers investment flows. A persistent current account deficit means the country is buying more from abroad than it sells, financed by borrowing or investment inflows — sustainable for a while, not indefinitely.
Exchange rates
Floating rates are set by supply and demand for the currency; fixed rates are maintained by the central bank. A depreciation makes exports cheaper and imports dearer, improving the current account — but only if the Marshall–Lerner condition holds, and the J-curve means it gets worse before it gets better.
Development and terms of trade
Economic development is broader than growth — the Human Development Index combines income, health and education. Many developing economies depend on primary exports with volatile prices and worsening terms of trade, which is why diversification is such a persistent policy theme.
The bit that catches people outA currency depreciation does not immediately improve the trade balance. Contracts are already signed and demand takes time to respond, so the deficit typically worsens first — the J-curve. Ignoring that timing makes an answer look naive.
The grown-up words
What it means
What it is called
Note
Producing more output with the same resources
absolute advantage
Not the basis for trade
Producing at a lower opportunity cost
comparative advantage
The basis for gains from trade
Tax on imported goods
tariff
Raises price, protects producers
Quantity limit on imports
quota
Restricts supply directly
Record of trade, income and transfers
current account
Part of the balance of payments
Fall in a floating currency's value
depreciation
Exports cheaper, imports dearer
Export prices relative to import prices
terms of trade
Often worsening for primary exporters
Check you have got it
Why can a country with an absolute advantage in everything still gain from trade?
Because it cannot produce everything at the lowest opportunity cost. Specialising where its comparative advantage is greatest and trading for the rest yields more total output for both countries.
Give one argument for and one against imposing a tariff on imported steel.
For: it protects domestic producers and jobs while a young industry grows to competitive scale. Against: it raises input costs for every industry using steel, invites retaliation, and shelters inefficiency.
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Topic 7
The price system and the microeconomy (A2)
At A2 the demand curve stops being an assertion and becomes something derived from how consumers actually decide.
Picture itAt AS you were told demand slopes down. At A2 you are shown why: each extra unit gives less additional satisfaction than the last, so people will only buy more if the price falls. The curve is a conclusion, not an assumption.
Utility theory
Total utility rises with consumption but at a decreasing rate — diminishing marginal utility. A consumer maximises satisfaction where MUa/Pa = MUb/Pb for all goods, the equi-marginal principle. This directly generates a downward-sloping demand curve.
Budget lines and indifference curves
An indifference curve shows combinations giving equal satisfaction; it is convex because of the diminishing marginal rate of substitution. The budget line shows what is affordable. Optimum consumption is where the budget line is tangent to the highest attainable indifference curve.
Income and substitution effects
A price fall makes a good relatively cheaper (substitution effect, always increasing quantity) and makes the consumer effectively richer (income effect, direction depends on whether the good is normal or inferior). For a Giffen good, the income effect is negative and large enough to reverse the whole thing.
Costs, revenue and the short and long run
In the short run at least one factor is fixed, giving diminishing marginal returns and U-shaped cost curves. In the long run all factors vary, giving economies and diseconomies of scale. Distinguishing the two runs is essential and frequently muddled.
Market structures
Perfect competition: many firms, identical products, free entry, normal profit long run. Monopoly: one firm, barriers to entry, supernormal profit. Monopolistic competition: many firms, differentiated products. Oligopoly: few firms, interdependence, kinked demand curve, collusion incentives.
The bit that catches people outEconomies of scale and diminishing returns are not opposites, and they belong to different time periods. Diminishing returns is a short-run idea about adding a variable factor to a fixed one; economies of scale is a long-run idea about the size of the whole firm.
The grown-up words
What it means
What it is called
Note
Extra satisfaction from one more unit
marginal utility
Diminishes as consumption rises
MU per rupee equal across all goods
equi-marginal principle
Consumer equilibrium
Combinations giving equal satisfaction
indifference curve
Convex to the origin
Effect of a good becoming relatively cheaper
substitution effect
Always raises quantity
Falling long-run average cost as output grows
economies of scale
A long-run concept
Falling extra output from an added variable factor
diminishing marginal returns
A short-run concept
Few interdependent firms
oligopoly
Kinked demand curve
Check you have got it
Why is a firm in perfect competition unable to earn supernormal profit in the long run?
Free entry means supernormal profits attract new firms. Supply rises, price falls, and profits are competed away until only normal profit remains.
Explain why a Giffen good has an upward-sloping demand curve.
It is a strongly inferior good on which consumers spend a large share of income. A price rise makes them so much poorer in real terms that they buy more of it and less of better alternatives — the income effect outweighs the substitution effect.
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Topic 8
Government microeconomic intervention (A2)
At A2 the question is not just whether a market fails, but whether the fairest outcome and the most efficient one are the same thing — and they usually are not.
Picture itA market can be perfectly efficient and profoundly unfair: everything produced at least cost, and half the population unable to afford it. Efficiency and equity are separate criteria, and almost every policy trades one against the other.
Efficiency, precisely defined
Productive efficiency: producing at minimum average cost. Allocative efficiency: producing where price equals marginal cost, so the goods people value most are the ones made. Dynamic efficiency: improving over time through innovation. Pareto efficiency: nobody can gain without another losing.
Deadweight loss
Any departure from allocative efficiency — a monopoly, a tax, a price control — creates a triangle of lost surplus that nobody captures. Being able to identify and shade it on a diagram is a standard exam skill.
Equity versus efficiency
Horizontal equity treats equals equally; vertical equity treats unequals appropriately. Redistribution can reduce incentives to work and invest, so pursuing equity can cost efficiency. Where that trade-off should sit is a normative question, and the exam expects you to say so.
Measuring and addressing inequality
The Lorenz curve plots cumulative income against cumulative population; the Gini coefficient summarises it from 0 (perfect equality) to 1. Policies: progressive taxation, transfer payments, minimum wages, state provision of health and education.
Nudge theory and behavioural insights
People do not always behave as rational maximisers. Nudges — default enrolment in pensions, placing fruit at eye level, framing — change behaviour without banning anything. Cheap and often effective, but criticised as paternalistic and sometimes weak in effect.
The bit that catches people outAn efficient outcome is not necessarily a desirable one. Pareto efficiency says nothing about fairness — an allocation where one person has everything can be Pareto efficient. Treating efficiency as a synonym for 'good' is the standard A2 confusion.
The grown-up words
What it means
What it is called
Note
Producing at minimum average cost
productive efficiency
Bottom of the AC curve
Producing where price equals marginal cost
allocative efficiency
Resources match wants
Improving efficiency over time
dynamic efficiency
Through innovation
Lost surplus from a departure from optimum
deadweight loss
A triangle on the diagram
Curve plotting cumulative income against population
Lorenz curve
Further from the line = more unequal
Single measure of inequality from 0 to 1
Gini coefficient
0 is perfect equality
Changing behaviour without restricting choice
nudge
Behavioural economics
Check you have got it
Why does a monopoly create deadweight loss?
It restricts output and charges above marginal cost, so units that consumers value more than they cost to produce are not made. That lost surplus goes to nobody.
Give one way a progressive tax could reduce efficiency.
High marginal rates can reduce the incentive to work extra hours, take risks or invest, and may encourage avoidance or emigration of skilled workers.
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Topic 9
The macroeconomy (A2)
At A2 you stop describing macroeconomic outcomes and start explaining the mechanisms that produce them.
Picture itAt AS, inflation and unemployment were categories. At A2 they are connected: the Phillips curve says you can trade one for the other in the short run, and cannot in the long run. Whether that is true has driven fifty years of policy argument.
Money and the quantity theory
MV = PT. If velocity and transactions are stable, an increase in the money supply raises the price level proportionately — the monetarist claim. Critics argue V is not stable, particularly in a crisis, which is why the debate was never settled by the equation alone.
The Phillips curve
The short-run curve shows a trade-off between inflation and unemployment. The long-run curve is vertical at the natural rate of unemployment: attempts to push unemployment below it only raise expected inflation, shifting the short-run curve up. This is the expectations-augmented version.
Keynesian and monetarist views
Keynesians see AD as unstable and government intervention as necessary, with a horizontal AS section at low output. Monetarists see the economy as self-correcting at the natural rate, with intervention causing inflation. The difference is empirical as much as ideological.
Economic growth: actual and potential
Actual growth is a rise in real GDP; potential growth is an outward shift in the productive capacity. The business cycle — boom, downturn, recession, recovery — describes fluctuations of actual output around the potential trend.
Living standards and their measurement
Real GDP per capita is the starting point, but the HDI adds life expectancy and education, and other measures add inequality, environmental quality and self-reported wellbeing. Each measure emphasises something the others miss, which is the point of using several.
The bit that catches people outThe vertical long-run Phillips curve does not say unemployment cannot fall — it says it cannot be pushed below the natural rate by demand policy alone. Reducing the natural rate itself requires supply-side measures.
The grown-up words
What it means
What it is called
Note
MV = PT
quantity theory of money
Monetarist foundation
Short-run trade-off between inflation and unemployment
Phillips curve
Vertical in the long run
Unemployment when the labour market clears
natural rate of unemployment
Structural and frictional
Rise in actual real GDP
actual growth
Movement towards the PPC
Outward shift in productive capacity
potential growth
PPC shifts out
Fluctuation of output around trend
business cycle
Boom, recession, recovery
Income, health and education combined
Human Development Index
Broader than GDP
Check you have got it
Why is the long-run Phillips curve vertical?
Attempts to reduce unemployment below the natural rate raise inflation, and once workers expect that inflation they demand higher wages, returning unemployment to the natural rate at a permanently higher inflation rate.
Distinguish actual growth from potential growth.
Actual growth is a rise in real output, which can come from using spare capacity. Potential growth is an increase in the economy's maximum possible output, shown by an outward shift in the PPC or LRAS.
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Topic 10
Government macroeconomic intervention (A2)
Policy at A2 is judged on trade-offs, time lags and credibility — not on whether the diagram moves the right way.
Picture itA central bank announcing a low inflation target only works if people believe it. If they do, wage demands stay moderate and the target is easier to hit. If they do not, the bank has to prove itself with painfully high interest rates. Credibility is not a soft factor; it is the mechanism.
Policy objectives and instruments
Each objective needs an instrument. Trying to hit more objectives than you have instruments guarantees compromise — which is Tinbergen's rule, and it explains a great deal of policy frustration.
Inflation targeting and central bank independence
An independent central bank with a published target is more credible, because it cannot be pressured into pre-election stimulus. Credible targets anchor expectations, which makes the target cheaper to achieve. The criticism is democratic accountability.
Fiscal rules and debt
Rules limiting deficits or debt-to-GDP aim to prevent short-termism, but can force contraction in a recession, exactly when it is most damaging. Automatic stabilisers — taxes falling and benefits rising in a downturn — do the same job without a decision being made.
Policy conflicts in an open economy
Raising interest rates to control inflation attracts capital, raising the exchange rate, hurting exports and worsening the current account. In an open economy, no policy has one effect — which is why evaluation questions reward tracing the chain.
Evaluating policy properly
Consider effectiveness (does the mechanism work?), time lags, cost, distributional effects, unintended consequences and the counterfactual. A judgement should say under what conditions the policy works, not merely that it 'depends'.
The bit that catches people outSaying 'it depends' is not evaluation. Evaluation is saying what it depends on and which way: 'a fiscal stimulus works better when the economy has spare capacity, because otherwise it feeds into prices rather than output'.
The grown-up words
What it means
What it is called
Note
Need as many instruments as objectives
Tinbergen's rule
Explains policy compromise
Published inflation goal for the central bank
inflation target
Anchors expectations
Central bank free from political direction
independence
Increases credibility
Taxes and benefits moderating the cycle automatically
automatic stabilisers
No decision needed
Limit on deficits or debt
fiscal rule
Can force procyclical cuts
What would have happened without the policy
counterfactual
Basis of real evaluation
Check you have got it
Why does central bank credibility make an inflation target cheaper to achieve?
If people believe inflation will stay low, wage and price expectations stay low, so less monetary tightening is needed to keep actual inflation at target.
Give one drawback of a strict fiscal rule limiting the budget deficit.
In a recession, tax revenue falls and spending on benefits rises automatically. A strict rule would force spending cuts or tax rises exactly when demand is weakest, deepening the downturn.
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Topic 11
International economic issues (A2)
Deeper integration between economies brings gains and vulnerabilities in the same package, and neither can be taken without the other.
Picture itA country that trades heavily grows faster and is more exposed. Open the capital account and investment flows in — and can flow out overnight. Every argument about globalisation is a version of this same trade: more gain, more exposure.
Economic integration
Free trade area (no internal tariffs), customs union (plus a common external tariff), common market (plus free factor movement), monetary union (plus a single currency). Each step raises the gains and reduces national policy autonomy.
Trade creation and trade diversion
Trade creation is the gain from switching to a lower-cost partner inside the bloc. Trade diversion is the loss from switching away from a lower-cost outsider because of the common external tariff. Whether a customs union raises welfare depends on which dominates.
Exchange rate systems
Floating gives monetary policy independence and automatic adjustment, at the cost of volatility. Fixed gives certainty for traders but requires reserves and surrenders monetary autonomy. Managed float attempts a middle path. The impossible trinity says you cannot have fixed rates, free capital movement and independent monetary policy all at once.
Balance of payments adjustment
Expenditure-switching policies (devaluation, tariffs) redirect spending towards domestic goods; expenditure-reducing policies (fiscal or monetary tightening) cut total spending. The Marshall–Lerner condition — combined elasticities exceeding one — determines whether devaluation works at all.
Globalisation and development
Trade, foreign direct investment, technology transfer and remittances have raised incomes substantially in many countries. The costs are volatility, inequality within countries, environmental pressure and vulnerability to external shocks. A good answer weighs both with examples rather than choosing a side.
The bit that catches people outA customs union is not automatically welfare-improving. If it diverts trade away from a genuinely cheaper outside producer towards a more expensive member, the bloc's members are worse off in aggregate — the gains are conditional, not guaranteed.
The grown-up words
What it means
What it is called
Note
No internal tariffs, own external tariffs
free trade area
The loosest integration
Free trade area plus a common external tariff
customs union
Common trade policy
Switching to a lower-cost partner in the bloc
trade creation
Welfare gain
Switching away from a cheaper outsider
trade diversion
Welfare loss
Sum of elasticities exceeding one
Marshall-Lerner condition
Devaluation works
Cannot have fixed rates, free capital and monetary autonomy
impossible trinity
Choose two of three
Money sent home by workers abroad
remittances
Major flow for some economies
Check you have got it
Why can a country not have a fixed exchange rate, free capital movement and an independent monetary policy at once?
If capital moves freely, any interest rate different from the world rate causes capital flows that push the exchange rate away from the peg. Defending the peg forces the interest rate back, so monetary independence is lost.
Under what condition does a devaluation improve the current account?
When the Marshall–Lerner condition holds — the sum of the price elasticities of demand for exports and imports exceeds one — and even then, only after the J-curve lag.
Edvia Free Resources · Economics 9708 · Topic 11 — free to copy and share
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