IB Essay Practice

A merit good is a good that is deemed to have positive externalities of consumption, meaning the marginal social benefit (MSB) exceeds the marginal private benefit (MPB). Examples include education, healthcare, and vaccinations. In a free market, consumers base their decisions on MPB alone, so they consume at the point where MPB = MPC, giving quantity Qm. However, because MSB > MPB, the socially optimal quantity is Q*, where MSC = MSB. The free market therefore under-consumes merit goods — this is a form of market failure as resources are misallocated.

[A positive externality of consumption diagram should be drawn here, showing MPB, MSB, MPC=MSC, with Qm where MPB=MPC and Q* where MSB=MSC. The welfare loss triangle between MPB and MSB from Qm to Q* should be shaded. A subsidy shifts MPC down to MPC₁, reducing the price from Pm to Ps and increasing consumption from Qm towards Q*.]

A government subsidy to producers of the merit good reduces their costs of production, effectively shifting the supply curve (MPC) downward by the amount of the subsidy. This lowers the market price from Pm to Ps, making the good more affordable and increasing the quantity consumed from Qm towards Q*. If the subsidy is set equal to the marginal external benefit at Q*, it can theoretically eliminate the welfare loss entirely and achieve allocative efficiency. For example, the UK government subsidises childhood vaccinations through the NHS, making them free at the point of use — this has contributed to near-universal uptake of the MMR vaccine (approximately 95% coverage), close to the herd immunity threshold.

Subsidies — strengths: Subsidies work "with" the market mechanism, preserving consumer choice while changing the price signal to encourage greater consumption. They are particularly effective when the primary barrier to consumption is financial — making university education or healthcare affordable for lower-income households who would otherwise under-consume due to inability to pay. The subsidy reduces inequality of access without mandating behaviour, which is more compatible with individual freedom.

Subsidies — weaknesses: However, subsidies have significant limitations. They carry an opportunity cost — the tax revenue used to fund the subsidy could have been spent on other public services or left in the private sector. The government also faces information failure: accurately calculating the marginal external benefit to set the correct subsidy level is extremely difficult. If the subsidy is too generous, resources are over-allocated to the merit good; if too small, under-consumption persists. Furthermore, subsidies to producers may not be fully passed on to consumers if the market structure is imperfect — firms may absorb part of the subsidy as higher profits rather than reducing prices.

For instance, subsidies to private healthcare providers in the US have been criticised for inflating healthcare costs rather than improving access — the subsidies increase provider revenue but much of the benefit is captured by shareholders and administrators rather than patients. In contrast, Sweden's comprehensive subsidy of childcare (capped at 3% of household income) has achieved near-universal early childhood education, demonstrating that well-designed subsidies can be highly effective in specific institutional contexts.

Legislation — strengths: Legislation (such as compulsory education, mandatory vaccination, or seat belt laws) directly addresses the under-consumption problem by requiring consumption. It provides certainty of outcome — if compliance is enforced, consumption reaches the desired level regardless of price elasticity or financial constraints. Compulsory schooling in all developed countries has been instrumental in achieving near-universal literacy and numeracy.

Legislation — weaknesses: Legislation restricts individual freedom and may face political opposition, particularly in cultures that value personal autonomy. Enforcement is costly — monitoring compliance and penalising violations requires bureaucratic resources. For goods where consumption quality matters (education, healthcare), forcing consumption does not guarantee quality outcomes. Additionally, legislation does not address the cost barrier — mandating that all children attend school is ineffective if families cannot afford uniforms, transport, or the opportunity cost of lost child labour income. In developing countries, this cost barrier is often the primary reason for under-consumption of education.

In conclusion, neither subsidies nor legislation alone is universally more effective — the optimal policy depends on the nature of the merit good, the primary cause of under-consumption, and the institutional context. When the barrier is financial (cost of access), subsidies are more effective. When the barrier is behavioural (undervaluation of long-term benefits), legislation may be necessary. In practice, the most successful approaches combine both: compulsory education legislation ensures attendance while subsidies (free schooling) remove the financial barrier. A nuanced policy mix, tailored to the specific market failure, produces better outcomes than reliance on any single instrument.

Expansionary fiscal policy involves an increase in government spending (G) and/or a decrease in taxation (T), designed to increase aggregate demand. Demand-deficient (cyclical) unemployment occurs when there is insufficient aggregate demand in the economy to employ all willing workers — it is associated with a negative output gap and is the type of unemployment that increases during recessions. The multiplier effect means that an initial injection of government spending generates additional rounds of income and expenditure, producing a final increase in national income greater than the initial injection.

[A Keynesian AD/AS diagram should be drawn showing AD shifting right from AD to AD₁ in the spare capacity (horizontal) section of the AS curve. Real GDP increases from Y₁ to Y₂ with no increase in the price level. Label all axes, curves, and equilibrium points. A second diagram could show the classical AD/AS model with the AD shift leading to both higher output and higher prices along the upward-sloping SRAS.]

Since G is a component of AD (AD = C + I + G + (X−M)), an increase in government spending directly increases aggregate demand, shifting the AD curve to the right. On a Keynesian diagram, if the economy is operating in the spare capacity region, real GDP increases from Y₁ to Y₂ with little or no inflation — unemployed workers and idle capital are brought into productive use. The multiplier amplifies this effect. During the COVID-19 pandemic, the UK's furlough scheme (£70 billion) and the US American Rescue Plan ($1.9 trillion) were expansionary fiscal interventions that prevented mass unemployment by maintaining household income and aggregate demand.

For demand-side policies: Demand-side policies (fiscal and monetary) are directly targeted at addressing demand-deficient unemployment. When AD falls during a recession, the immediate problem is insufficient spending — expansionary policy injects spending into the economy, directly creating demand for goods and services and therefore demand for labour. Government infrastructure projects directly employ workers. Tax cuts and lower interest rates boost consumption and investment, supporting private sector employment. The effect is relatively quick compared to supply-side reforms, making demand-side policies the appropriate first response to recessionary unemployment.

The effectiveness of demand-side policies was demonstrated during the 2008–09 financial crisis. China's 4 trillion yuan stimulus package maintained GDP growth above 6% and kept urban unemployment stable, while countries that pursued austerity (Greece, Spain) experienced unemployment rates exceeding 25%. This natural experiment strongly supports the Keynesian case for demand management during demand-deficient downturns.

Limitations of demand-side: Demand-side policies are ineffective against structural unemployment — workers who lack the skills demanded by a changing economy, or who are geographically immobile, will not be hired simply because AD increases. If AD is stimulated when unemployment is primarily structural, the result is inflation rather than job creation. Furthermore, expansionary fiscal policy may be constrained by high existing debt levels, and monetary policy may be ineffective at the zero lower bound (the liquidity trap). Crowding out — where government borrowing raises interest rates and reduces private investment — may partially offset the stimulus.

For supply-side policies: Supply-side policies address the root causes of structural and frictional unemployment. Education and training programmes (e.g. Germany's dual education system combining academic learning with apprenticeships) equip workers with skills demanded by employers. Labour market reforms (reducing hiring costs, improving job matching through employment agencies) reduce frictional unemployment. These policies reduce the natural rate of unemployment (the LRPC shifts left) and create sustainable employment that does not depend on continued fiscal stimulus.

Limitations of supply-side: Supply-side policies take many years to show results. Retraining programmes for displaced manufacturing workers take 2–5 years; education reform takes a generation. Workers facing unemployment today need solutions today — telling someone who has lost their job that education investment will improve the labour market in 15 years is inadequate. Supply-side reforms may also be politically difficult (reducing employment protection, reforming welfare) and can worsen inequality in the short term.

In conclusion, the "more effective" policy depends entirely on the type of unemployment and the time horizon. For demand-deficient unemployment during recessions, demand-side policies are clearly more effective — they directly address the cause and produce faster results. For structural unemployment and long-run labour market efficiency, supply-side policies are more appropriate. In practice, the most effective strategy is a coordinated approach: demand-side policies to manage the business cycle and maintain output near potential, combined with supply-side reforms to progressively reduce the natural rate of unemployment and build a more skilled, flexible workforce. Framing this as an "either/or" choice is a false dichotomy — both are necessary for different purposes.

An oligopoly is a market structure dominated by a small number of large firms, characterised by high barriers to entry, product differentiation (or homogeneity), and crucially, interdependence — each firm's pricing and output decisions are influenced by the expected reactions of rival firms. This interdependence distinguishes oligopoly from other market structures and creates strategic behaviour, analysed using game theory.

The kinked demand curve model (attributed to Paul Sweezy) explains why prices in oligopolistic markets tend to be rigid — they change less frequently than in competitive markets. The model assumes that if a firm raises its price, rivals will not follow (because they can gain market share by keeping their prices unchanged), so the firm faces a relatively elastic demand curve above the current price — it loses significant sales. However, if the firm lowers its price, rivals will match the cut (to avoid losing market share), so the firm faces a relatively inelastic demand curve below the current price — it gains very few additional sales.

[The kinked demand curve diagram shows a kink at the current price. Above the kink, demand is elastic (flat). Below the kink, demand is inelastic (steep). The MR curve has a vertical discontinuity (gap) at the kink quantity. MC can shift within this gap without changing the profit-maximising price or output — explaining price rigidity even when costs change.]

This produces a kink in the demand curve at the current market price, with a corresponding discontinuity (vertical gap) in the MR curve. The discontinuity means that MC can shift up or down within the gap without changing the profit-maximising output or price — explaining price rigidity. Real-world evidence supports this: UK petrol stations, supermarkets, and mobile phone networks exhibit price stickiness and tend to match rivals' price cuts rapidly while ignoring price increases.

Collusion harms welfare: When oligopolistic firms collude — whether formally through a cartel (like OPEC) or tacitly through price leadership and signalling — they effectively act as a collective monopoly. The colluding firms restrict output below the competitive level and raise prices above marginal cost, creating allocative inefficiency and a deadweight welfare loss identical to that of monopoly. Consumer surplus transfers to producer surplus, and some surplus is lost entirely. The OPEC cartel's production quotas, for example, have historically maintained oil prices well above competitive levels, transferring wealth from consumers globally to oil-producing nations.

Evidence of the harm from collusion is abundant. The European Commission fined five major truck manufacturers €2.93 billion in 2016 for colluding on pricing over 14 years. The UK construction industry cartel (exposed in 2009) involved 103 firms engaging in bid-rigging, costing public sector clients millions in inflated contract prices. In each case, consumers (including taxpayers) paid artificially high prices for goods and services.

Counter-arguments — stability and investment: Some economists argue that price stability resulting from tacit collusion can benefit consumers and the economy. Volatile prices create uncertainty for both consumers and firms, increasing risk and discouraging long-term investment. Stable oligopoly pricing may encourage firms to invest in quality improvements, R&D, and capacity expansion — forms of non-price competition that benefit consumers through better products and innovation, even if prices are somewhat above the competitive level.

Collusion is inherently unstable: Game theory (the prisoner's dilemma) reveals that collusion is difficult to sustain. Each firm has an individual incentive to cheat on the agreement — by secretly lowering prices or increasing output, a single firm can capture a larger market share at the expense of its colluding partners. This "free-rider" problem means cartels tend to break down over time, particularly when there are many firms, the product is differentiated, demand is declining, or monitoring is difficult. OPEC's frequent inability to enforce production quotas illustrates this instability. The self-correcting nature of the prisoner's dilemma suggests that the welfare damage from collusion may be temporary and self-limiting.

The role of regulation: The existence and effectiveness of competition authorities significantly affects the welfare outcome. The UK's Competition and Markets Authority (CMA) and the European Commission actively investigate and penalise collusion, with powers to impose fines of up to 10% of global turnover and grant immunity to firms that report cartel behaviour (leniency programmes). These interventions increase the expected cost of collusion and reduce its incidence and duration — mitigating welfare harm.

In conclusion, explicit collusion (cartels and price-fixing) clearly harms economic welfare by replicating monopoly outcomes and should be prohibited and penalised, as it is in most jurisdictions. Tacit collusion is more nuanced — while it raises prices above competitive levels, it may also provide price stability and encourage investment in innovation. The extent of welfare harm depends on the magnitude of the price increase, the availability of substitutes, the duration of the collusion, and the effectiveness of competition regulation. The key policy objective should be to maintain vigorous competition through strong antitrust enforcement while recognising that some degree of strategic interaction between oligopolists is an inevitable feature of concentrated markets, not necessarily a welfare-reducing one.

Trade liberalisation is the removal or reduction of barriers to international trade, including tariffs, quotas, and administrative restrictions. The theoretical foundation is David Ricardo's law of comparative advantage, which states that countries should specialise in producing goods for which they have the lowest opportunity cost and trade for other goods. Even if one country has an absolute advantage in all goods, both countries can benefit from specialisation and exchange — total world output increases and both trading partners can consume beyond their production possibility curves.

Trade liberalisation offers several economic benefits. First, it allows countries to exploit their comparative advantage, increasing allocative efficiency globally. Second, access to larger international markets enables firms to achieve greater economies of scale, reducing average costs. Third, increased competition from imports forces domestic firms to become more efficient, driving productivity improvements and innovation. Fourth, consumers benefit from lower prices, greater variety, and access to goods not produced domestically. The creation of the WTO (1995) and successive rounds of trade liberalisation have been associated with a dramatic expansion of world trade — global merchandise exports grew from $5.2 trillion in 2000 to $25.3 trillion in 2022.

The infant industry argument: The strongest case for protectionism in developing countries is the infant industry argument. Newly established industries in developing economies cannot compete with established foreign firms that benefit from economies of scale, accumulated expertise, and brand recognition. Temporary tariff protection allows domestic firms to grow, achieve competitive scale, and develop capabilities before facing international competition. Historical evidence supports this: South Korea's electronics industry (Samsung, LG) and Japan's automobile sector (Toyota, Honda) both developed behind significant tariff walls before becoming globally competitive. The key is that protection must be temporary and conditional on progress — permanent protection creates inefficiency and rent-seeking.

The East Asian development experience provides the strongest evidence for strategic protectionism. South Korea's average tariff rate exceeded 40% in the 1960s–70s, during which it developed its heavy industry and technology sectors. As industries matured, tariffs were progressively reduced — Korea's average tariff is now under 14%. In contrast, many Sub-Saharan African countries that liberalised rapidly under World Bank structural adjustment programmes in the 1980s–90s experienced de-industrialisation as domestic manufacturers were overwhelmed by cheaper imports, without developing the competitive capacity to benefit from trade.

[A tariff diagram should be drawn showing the domestic supply and demand curves, the world price (Pw), and the world price plus tariff (Pw+t). The diagram should clearly show: the increase in domestic production (Q1 to Q2), the decrease in imports (from Q4−Q1 to Q3−Q2), government tariff revenue (the rectangle), and the two deadweight welfare loss triangles.]

Against protectionism: However, protectionist policies carry significant risks and costs. Tariffs create deadweight welfare losses — consumers pay higher prices and consume less than the efficient quantity. Protected industries face no competitive pressure to improve, leading to X-inefficiency and technological stagnation. Protection often becomes permanent as politically powerful domestic producers lobby to maintain barriers ("government failure" through regulatory capture). Trading partners may retaliate with their own tariffs, reducing the developing country's export opportunities and triggering a destructive trade war that harms all participants.

Terms of trade and dependency: Developing countries that specialise in primary commodity exports face the risk of declining and volatile terms of trade (the Prebisch-Singer hypothesis). Protectionism to promote diversification into manufacturing may be justified on the grounds that it reduces vulnerability to commodity price shocks and builds a more resilient economic structure. However, this must be weighed against the static efficiency losses from diverting resources away from sectors of genuine comparative advantage.

In conclusion, protectionism can be justified for developing countries under specific, limited conditions: when industries have genuine potential to become competitive (not just any industry), when protection is temporary with a clear exit timeline, and when the government has the institutional capacity to resist capture by special interests. The historical record shows that successful development strategies (East Asia) combined targeted, temporary protection with aggressive export promotion and investment in human capital — not blanket, permanent tariffs. For most developing countries, the optimal approach is neither pure free trade nor comprehensive protection, but strategic, time-limited industrial policy that progressively integrates the economy into global markets as domestic capacity develops.