IB Economics HLTopic 4 — The Global EconomyPaper 1, 2 & 3Core idea~12 min read
Market-Based and Interventionist Policies
Every development policy sits somewhere on a line. At one end, get the state out of the way and let firms and individuals chase profit. At the other, step in and correct what the market gets wrong. Almost every essay in this unit is an argument about where on that line to stand.
📚 What you need to know
Market-based strategies create conditions for private firms and individuals to raise output and profit.
The main three are trade liberalisation, privatisation and deregulation.
Interventionist strategies correct market failure and promote welfare directly.
The main three here are tax policy, transfer payments and minimum wages.
Interventionist policies aim to raise human capital, productivity and output.
Real economies use both; the exam question is about the balance, not a winner.
The spectrum
The last line is the point that wins evaluation marks. Neither approach works without institutions, which is why the same policy succeeds in one country and fails next door.
Market-based strategies
Policy
What it does
Advantages
Disadvantages
Trade liberalisation
Removes tariffs, quotas and other barriers to international trade
More trade raises output, employment and incomes; costs of production fall; consumers pay less; resources are allocated more efficiently worldwide
Global competition intensifies and weaker firms fail, creating structural unemployment as inefficient industries die out
Privatisation
Sells state-owned firms so private companies enter and compete
More competition raises output and employment; private firms are often more efficient; consumers may see lower prices; sale proceeds can fund merit and public goods
Assets are often sold below fair value; service quality can fall as firms chase profit; wages may be cut and jobs lost; a private monopoly can raise prices instead
Deregulation
Removes government rules and controls from markets
Lower compliance costs mean greater supply; less regulation encourages innovation and enterprise
Can create an environment for corruption; negative externalities rise without rules; foreign firms may end up monopolising the industry
Privatisation has one trap worth naming. Selling a state monopoly to a private owner without also creating competition changes who collects the profit and nothing else. The gains in the advantages column all depend on new firms actually entering.
Interventionist strategies
Policy
What it does
Advantages
Disadvantages
Tax policy
A progressive system takes a higher share from higher incomes and redistributes it
Funds free education and healthcare; supports poorer households and the unemployed; reduces income inequality directly
Gains can be cancelled out by regressive indirect taxes; very high rates may act as a disincentive to work; weak collection undermines the design
Transfer payments
Payments to the poorest and most vulnerable, including unemployment, disability and pension support
Protects the worst off; raises consumption and therefore aggregate demand; helps households over the threshold where saving becomes possible
Poorer countries have least revenue to fund it; every payment has an opportunity cost; often politically unpopular despite the economic case
Minimum wages
Sets a legal floor above the free market wage
Higher wages and more disposable income; consumption and aggregate demand rise; living standards improve
Costs of production rise, which can reduce international competitiveness; output may fall and unemployment rise if the floor is set too high
Why interventionist policy is also a supply-side policy
Transfer payments and progressive taxes are usually taught as demand-side and fairness measures. In a development context they do something else as well: spending on health and education raises human capital, which raises productivity, which expands what the economy can produce.
If you can bring this diagram into an answer about education or healthcare spending, do. It turns a description of a policy into an argument about productive capacity.
The timing problem. Market-based policies tend to show results within a few years. Interventionist human capital policies take a generation. Governments face elections in between, which is one reason the long-term policy is so often the one that gets cut.
Worked examples
WORKED EXAMPLE 1
A country taxes the first $10,000 of income at 0%, the next $10,000 at 20% and everything above $20,000 at 40%. Calculate the average tax rate for someone earning $20,000 and someone earning $60,000, and explain what this shows. [4]
Step 1: the $20,000 earner0 + (10,000 × 0.20) = $2,000
Average rate = 2,000 ÷ 20,000 = 10%Step 2: the $60,000 earner0 + 2,000 + (40,000 × 0.40) = $18,000
Average rate = 18,000 ÷ 60,000 = 30%Step 3: what it shows
The average rate rises with income, which is the definition of a progressive system. The higher earner pays three times the proportion, not just three times the amount.
10% and 30% — progressive by constructionwatch for indirect taxes elsewhere in the question; they can offset all of this
WORKED EXAMPLE 2
Evaluate the view that market-based policies are the best route to development for a low-income country. [15-style plan]
Case for
Liberalisation, privatisation and deregulation raise output, attract foreign investment and improve efficiency, all of which lift real GDP and can start the growth loop of the poverty trap turning.
Case against 1: market failure
Merit goods stay under-provided and negative externalities go uncorrected, so development lags behind growth.
Case against 2: distribution
The gains concentrate among those who already own assets, so inequality widens and the poverty trap holds for most households.
Case against 3: institutions
Without a sound legal system and honest enforcement, deregulation can simply create room for corruption.
Judgement
Market policies are effective at raising output and poor at distributing it. A low-income country needs both: liberalisation to grow the economy and intervention to convert that growth into human development.
Neither on its own; the balance depends on the strength of institutions
💡 Exam tip
Frame the answer as a spectrum, not two teams. That structure alone reads as evaluation.
For any development policy, ask whether it targets growth or distribution — they are different jobs.
Bring in a PPC or LRAS shift when discussing education and health spending.
Use the timing contrast: market policies act faster, human capital policies act deeper.
Make institutions your evaluation anchor. Both approaches depend on them.
⚠ Common mix-up
Deregulation is not privatisation. One removes rules, the other transfers ownership.
Market-based does not mean no government. It still needs courts, contracts and property rights.
Transfer payments are not counted in GDP as government spending on goods. They raise consumption when spent.
A minimum wage does not automatically cause mass unemployment. It depends where it is set relative to the market wage.
Do not argue that one approach always wins. The best answers say it depends, and then say on what.
Up next: Merit Goods and Inward Foreign Direct Investment — the two interventions with the biggest long-run effect, and the one that comes with strings attached.
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