Economics 9708/23 — May/June 2017

Background Concept

Aggregate demand (AD) is the total demand for all final goods and services produced in an economy over a given period. It is composed of four components: consumer spending (C) by households, investment spending (I) by businesses on capital goods, government spending (G) on public services and infrastructure, and net exports (X - M), which is the value of exports minus the value of imports. Shocks to any of these components will shift the AD curve, affecting real output, employment, and the price level.

Understanding the Question

This 6-mark question asks you to explain how a fall in Chinese demand for Zambia’s copper exports will affect each of the four components of aggregate demand in Zambia. The extract provides context that copper is Zambia’s main export, a key driver of its economy, and that the government is facing a larger fiscal deficit as a result of the slowdown.

Approach

First, clearly state the formula for aggregate demand and name its four components to earn the first 2 marks. Then, for each component, explain the specific transmission mechanism from the fall in copper demand to that component, using evidence from the extract where relevant. You can note short-run vs long run effects where appropriate.

Step-by-Step Reasoning

1. Identify AD components: Aggregate demand is calculated as AD = C + I + G + (X - M), where C = consumption, I = investment, G = government spending, and (X - M) = net exports. Naming these components explicitly earns up to 2 marks.
2. Effect on Consumption (C): The extract states that a large mining group is suspending production and a Chinese-owned firm is cutting jobs in Zambia. Mining is a key sector of the economy, so these job losses and reduced working hours will lower household disposable incomes for miners and workers in related sectors (such as transport and equipment supply). With lower disposable incomes, households will reduce their spending on consumer goods and services, so C falls.
3. Effect on Investment (I): Lower copper prices reduce expected future profits for mining firms and other businesses that rely on the mining sector. With lower expected returns on investment, firms will postpone or cancel planned investment projects (such as new mining equipment or factory expansion), so I falls.
4. Effect on Government Spending (G): The extract notes that copper accounts for 25-30% of government revenue. Lower copper export earnings reduce tax revenues from the mining sector, leading to a larger fiscal deficit than expected. The government has pledged to reduce spending to cut the deficit, so G will fall (or grow more slowly) in the short run. Alternatively, higher unemployment from mining job cuts may increase government spending on unemployment benefits and other welfare support, but the extract’s emphasis on spending cuts means the net effect is likely a fall in G.
5. Effect on Net Exports (X - M): Exports make up a large share of Zambia’s AD, with copper accounting for 70% of foreign exchange earnings. The fall in copper demand and prices directly reduces the value of Zambia’s exports (X), so net exports (X - M) fall in the short run. In the long run, the depreciation of the kwacha (identified in part (a)) will make other Zambian exports cheaper for foreign buyers and imports more expensive for Zambian buyers, which could raise net exports. However, the immediate impact of the copper demand shock is a fall in net exports.

Key Takeaways

• Aggregate demand components are interlinked: a shock to one sector (mining) affects household incomes, business profits, government revenues, and export earnings, which in turn affect all AD components.
• External shocks to export demand can have widespread effects on a small open economy that relies heavily on a single export.

Common Mistakes

• Only naming the AD components without explaining how each is affected, which limits marks to the first 2.
• Forgetting that government spending can have two opposing effects (higher welfare spending vs spending cuts), and not explaining which effect dominates in the given context.
• Confusing net exports with just exports, or forgetting that import values also affect net exports.

Things to Be Careful About

• Use the extract’s specific data (e.g. copper makes up 70% of foreign exchange earnings, 25-30% of government revenue) to justify your explanations.
• Distinguish between short-run and long run effects where relevant, as the mark scheme accepts both for net exports.

Background Concept

The theory of comparative advantage, developed by David Ricardo, states that a country has a comparative advantage in producing a good if it can produce it at a lower opportunity cost than other countries. If countries specialise in producing goods for which they have a comparative advantage, and trade for other goods, total global output increases, and all trading countries can consume beyond their domestic production possibility frontier (PPF). This is the core economic argument for free trade and specialisation.

However, the theory of comparative advantage has limitations. It assumes stable global prices for goods, no transport costs, perfect information, and that resources can move freely between sectors. For countries that rely heavily on a single primary commodity export, volatile global prices for that commodity can create significant economic instability, which the static theory of comparative advantage does not account for. Diversification is a supply-side policy that involves developing a wider range of economic sectors to reduce reliance on a single export, with the aim of increasing economic resilience.

Understanding the Question

This 6-mark evaluative question asks you to consider whether economic theory supports the view that diversification of Zambia’s economy is the most effective way to tackle the problems it faces from China’s economic slowdown. The extract highlights that Zambia’s over-reliance on copper exports has left it highly vulnerable to falls in copper demand and prices, leading to falling export earnings, a larger fiscal deficit, currency depreciation, and job losses in mining.

Approach

To answer this, you need to:

1. First, state the relevant economic theory (comparative advantage and the benefits of specialisation) that would argue against diversification.
2. Then, discuss the benefits and costs of diversification as a policy to address Zambia’s problems.
3. Next, discuss the benefits and costs of maintaining specialisation in copper, as supported by economic theory.
4. Finally, weigh the two approaches against each other to reach a justified conclusion on whether diversification is the most effective solution.

Step-by-Step Reasoning

1. Relevant economic theory supporting specialisation: The theory of comparative advantage argues that countries should specialise in producing goods where they have the lowest opportunity cost. Zambia has large copper reserves, an established mining sector, and has benefited from Chinese FDI in mining, giving it a comparative advantage in copper production. Specialisation in copper has allowed Zambia to achieve high economic growth (6.4% annual average over the last decade) by allocating resources to their most efficient use, and trading copper for other goods. This suggests that maintaining specialisation in copper would maximise output and welfare in the long run.
2. Benefits of diversification: Diversification would reduce Zambia’s reliance on copper, making the economy less vulnerable to external shocks such as falls in global copper prices or demand from major importers like China. This would lead to more stable government revenues (reducing the risk of large fiscal deficits during price slumps), more stable household incomes, and lower risk of currency depreciation. It would also create jobs in new sectors for workers displaced from the mining industry, reducing unemployment. Over time, a more diversified economy can build new comparative advantages in other sectors, increasing long-run resilience.
3. Costs of diversification: Shifting resources away from copper production, where Zambia has a current comparative advantage, involves an opportunity cost: labour, capital and land used in new sectors would have produced more output if used in the mining sector. Developing new industries also requires significant investment in infrastructure, training and technology, which is costly and takes time, especially for a country with limited fiscal space due to the current deficit. New sectors may also lack the skills and scale to compete with established global producers, leading to inefficiency and lower output in the short to medium term.
4. Benefits of maintaining specialisation: Sticking with copper specialisation allows Zambia to exploit its existing comparative advantage, leading to higher output, export earnings and economic growth. The mining sector benefits from economies of scale as production increases, and Zambia remains attractive to foreign direct investment in mining, as seen during the China boom years. Specialisation also allows Zambia to trade copper for other goods it needs, increasing consumer choice and welfare.
5. Costs of maintaining specialisation: Over-reliance on copper makes Zambia highly vulnerable to external price and demand shocks, as seen in the current slowdown. This leads to volatile economic growth, large fiscal deficits when copper prices fall, currency depreciation (which increases import prices and inflation), and high unemployment in the mining sector during price slumps. The extract notes that Zambia is the African nation most exposed to China’s slowdown, highlighting the severity of this vulnerability.
6. Evaluation and conclusion: While static comparative advantage theory supports specialisation in copper, the severe vulnerability created by over-reliance on a single volatile commodity means that diversification is the most effective long-term solution to Zambia’s current problems. The short-run opportunity costs of diversification are outweighed by the long-run benefits of a more resilient economy, even if diversification is a slow and costly process. Economic theory supports this because dynamic comparative advantage can be built over time through investment in new sectors, and the risks of over-specialisation in a single commodity outweigh the static gains from specialisation in Zambia’s context.

Key Takeaways

• Static comparative advantage supports specialisation, but this assumes stable global prices and no large external shocks.
• Over-specialisation in a single volatile commodity creates significant economic vulnerability, which can outweigh the benefits of specialisation.
• Diversification is a supply-side policy aimed at building dynamic comparative advantage and economic resilience, even if it involves short-run opportunity costs.
• Evaluative answers require weighing both sides of an argument and reaching a justified, specific conclusion.

Common Mistakes

• Only discussing one side of the argument (e.g. only the benefits of diversification, or only the benefits of specialisation), which forfeits all evaluation marks.
• Failing to link the discussion to economic theory, instead just listing generic pros and cons of diversification.
• Reaching a vague or unsupported conclusion, such as "it depends" without explaining what it depends on, or which option is better in Zambia’s case.
• Forgetting to mention opportunity costs when discussing diversification, which is a core concept in the theory of specialisation.

Things to Be Careful About

• Explicitly link each point to economic theory (e.g. comparative advantage, opportunity cost, production possibility frontiers) to demonstrate knowledge and understanding.
• Use the extract’s specific context (Zambia’s reliance on copper, the problems caused by the price fall) to tailor your answer to the question, rather than writing a generic essay on diversification.
• Ensure your conclusion is justified: it must state which option is more effective and why, based on the arguments you have presented.