IBDP Economics 2.7 Role of government in microeconomic HL Paper 1- New Syllabus
Question
(a) Explain the importance of income elasticity of demand (YED) for the primary, manufacturing and service sectors of the economy when real incomes are rising. [10]
(b) Using real-world examples, evaluate the view that the consumption of demerit goods is best reduced through legislation and regulation. [15]
Most-appropriate topic code (CED):
• TOPIC 2.7: Role of government in microeconomics
▶️ Answer/Explanation
(a) Answer:
Income elasticity of demand (YED) measures the responsiveness of quantity demanded of a good or service to a change in consumers’ income, ceteris paribus. When real incomes rise, YED is important because it determines how quickly demand for different goods and services increases.
Primary sector: Primary commodities such as agricultural products and basic raw materials generally have a relatively low positive YED. As real incomes rise, consumers may increase their consumption of basic necessities such as food, but the increase in quantity demanded is proportionately smaller than the increase in income.
Consequently, as an economy becomes wealthier, demand for primary commodities tends to grow relatively slowly. This means that the relative importance of the primary sector may decline as a share of total economic activity, even though the absolute demand for some primary products may continue to increase.
Manufacturing sector: Manufactured products generally have a higher YED than basic primary commodities. As real incomes rise, consumers tend to purchase more manufactured goods such as cars, electronics, appliances and other durable goods. Therefore, demand for manufactured products can increase more rapidly than demand for basic commodities.
This can encourage firms in the manufacturing sector to expand production and investment as household incomes rise. As a result, the manufacturing sector may initially become increasingly important in the process of economic development.
Service sector: Many services have relatively high positive YED. As real incomes rise, consumers can devote a greater proportion of their income to services such as tourism, entertainment, financial services, education and healthcare. Demand for these services may therefore increase faster than income.
As a result, rising real incomes can cause the service sector to expand significantly and become a larger proportion of total economic activity. This helps explain the increasing importance of the tertiary sector in higher-income economies.
Inferior goods: Some goods and services have a negative YED. These are known as inferior goods. As real incomes rise, consumers demand less of them because they can afford to switch to higher-quality alternatives. For example, consumers may reduce their consumption of low-cost staple foods or basic forms of transport as their incomes increase.
An Engel curve can show the relationship between income and quantity demanded. For a normal good with positive YED, quantity demanded increases as income rises. For an income-elastic good, quantity demanded rises more than proportionately, while for an income-inelastic good it rises less than proportionately. For an inferior good, quantity demanded falls as income rises.
Therefore, YED is important for understanding the changing composition of an economy as real incomes rise. Low-YED primary commodities tend to experience slower growth in demand, while manufacturing and particularly many services can experience faster growth. Negative-YED inferior goods may experience falling demand as incomes increase.
(b) Answer:
A demerit good is a good whose consumption is considered harmful to consumers and may be overconsumed because individuals do not fully recognize the costs of consumption. Consumption may also impose negative externalities on third parties. Legislation and regulation involve government rules that directly restrict or control the consumption, production or availability of such goods.
Legislation and regulation can be effective because they directly restrict harmful consumption. Governments can prohibit certain forms of consumption, restrict where a product can be used, impose minimum age requirements or regulate its sale and advertising.
For example, smoking bans in public places directly restrict where cigarettes can be consumed. This reduces exposure of non-smokers to second-hand smoke and can also discourage smoking by making consumption less convenient. Similarly, restrictions on tobacco advertising reduce firms’ ability to encourage consumption.
Legislation can therefore directly reduce consumption and help move the marginal private benefit (MPB) of consumption closer to the marginal social benefit (MSB) by preventing or discouraging consumption that creates external costs.
Regulation can also be relatively easy to understand and enforce. A legal restriction establishes a clear rule that consumers and producers must follow. For example, governments can prohibit the sale of cigarettes to people below a specified age. This directly prevents a particular group from purchasing the product rather than relying entirely on consumers to change their behaviour voluntarily.
However, legislation and regulation are not necessarily the best policy in every situation.
One limitation is enforcement. If restrictions are too severe, consumers may attempt to avoid them through illegal markets or other forms of non-compliance. This can reduce the effectiveness of the policy and create additional costs for enforcement.
For example, severe restrictions on tobacco or alcohol may encourage some consumers to purchase products through informal or illegal channels. The government may then lose tax revenue while consumption continues.
Indirect taxation can be an alternative. An indirect tax raises the price of a demerit good, reducing quantity demanded and internalizing some of the external cost. The policy also generates government revenue, which can be used to fund healthcare or information campaigns.
For example, higher taxes on cigarettes increase the price of smoking and provide a financial incentive to reduce consumption. However, if demand is highly price inelastic because of addiction, the reduction in consumption may be relatively small even though tax revenue increases substantially.
Education and awareness campaigns provide another alternative. Governments can inform consumers about the health and social costs of consuming demerit goods. If consumers have imperfect information, providing accurate information may cause them to make better-informed decisions and reduce consumption voluntarily.
For example, public health campaigns explaining the health risks of smoking can discourage people from starting to smoke and encourage existing smokers to quit. However, information campaigns may be less effective where consumers already understand the risks but continue consuming because of addiction or other behavioural factors.
Nudges may also influence behaviour without directly prohibiting consumption. For example, governments can make healthier options more visible or change the way information is presented to consumers. Such policies preserve consumer choice but may produce a smaller effect than direct regulation.
Governments can also subsidize less harmful substitutes. For example, subsidizing public transport could make it cheaper relative to private car use. This may reduce consumption of private transport and associated negative externalities such as congestion and pollution, while maintaining consumer choice.
Real-world example: The regulation of tobacco provides evidence for the effectiveness of legislation. Restrictions on smoking in enclosed public places, advertising bans and minimum-age rules have reduced opportunities to consume and promote tobacco. However, tobacco taxation and public health campaigns have also played important roles, suggesting that regulation does not necessarily work best in isolation.
Another consideration is the nature of the demerit good. Direct regulation may be particularly effective when consumption creates substantial negative externalities or when consumption must be prevented in specific circumstances. For example, banning smoking in enclosed public places can directly protect third parties from second-hand smoke.
In contrast, where the objective is to reduce overall consumption while preserving consumer choice, an indirect tax may be more appropriate. The relative effectiveness therefore depends on the specific characteristics of the good and the government’s objective.
Overall evaluation: Legislation and regulation can be highly effective because they directly restrict harmful behaviour and can reduce negative externalities, particularly where consumption imposes significant costs on third parties. They are especially useful when the government needs a clear and immediate restriction.
However, the word “best” means that legislation and regulation must be compared with alternative policies. Indirect taxes can provide incentives to reduce consumption while generating government revenue; education can address information failure; nudges can influence behaviour while preserving choice; and subsidies for less harmful substitutes can encourage consumers to switch.
Therefore, legislation and regulation are not always the best method of reducing demerit-good consumption. They are likely to be most effective when direct control is necessary to prevent substantial harm to consumers or third parties. However, a combination of regulation, taxation, education and incentives may achieve a greater reduction in consumption while minimizing unintended consequences and preserving an appropriate degree of consumer choice.
Question
(a) Explain why the price elasticity of supply (PES) for primary commodities is generally lower than the PES for manufactured products. [10]
(b) Using real-world examples, discuss the consequences for markets and stakeholders of an increase in indirect tax on a good or service. [15]
Most-appropriate topic code (CED):
• TOPIC 2.7: Role of government in microeconomics
▶️ Answer/Explanation
(a) Answer:
Price elasticity of supply (PES) measures the responsiveness of the quantity supplied of a good to a change in its price, ceteris paribus. Primary commodities generally have a relatively inelastic supply, whereas manufactured products tend to have a relatively more elastic supply.
1. The time period required to increase production is generally longer for primary commodities.
Many primary commodities, particularly agricultural products, depend on natural production cycles. Farmers cannot immediately increase the supply of crops following an increase in price because additional production may require several months or even years. Therefore, in the short run, the quantity supplied responds relatively little to a price increase, giving primary commodities a relatively low PES.
Manufactured products can often be produced more quickly by increasing working hours, using additional machinery or reallocating resources between production lines. Therefore, manufacturers may respond more rapidly to higher prices by increasing output, making the supply of manufactured products relatively more elastic.
2. Factors of production are generally less mobile and storage is more difficult for many primary commodities.
Production of primary commodities is often dependent on specific land, climate and natural resources. These factors cannot easily be moved or increased when prices rise. This limits the ability of producers to respond to changes in price and contributes to relatively inelastic supply.
In addition, some primary commodities are perishable and cannot be stored easily for long periods. For example, fresh agricultural products cannot simply be held in storage and released when prices rise. This reduces producers’ ability to adjust the quantity supplied in response to price changes.
Manufactured products are generally easier to store and producers may have unused capacity. If factories are operating below full capacity, firms can increase production relatively quickly when prices rise without immediately requiring large amounts of additional capital. This makes their supply relatively more elastic.
3. Costs of increasing production can also affect PES.
For primary commodities, expanding production may require substantial increases in land, labour and other inputs. As production expands, costs may rise significantly, limiting the response of quantity supplied to a higher price.
Manufacturing firms may be able to expand production using existing machinery and facilities, particularly when there is spare capacity. This allows quantity supplied to respond more strongly to price changes.
A relatively steep supply curve can represent the inelastic supply of a primary commodity, while a relatively flatter supply curve can represent the more elastic supply of a manufactured product. The flatter supply curve shows that a given change in price results in a larger percentage change in quantity supplied.
Therefore, the PES of primary commodities is generally lower because production often requires longer time periods, factors of production are less mobile, storage may be difficult and production capacity cannot be increased quickly. Manufactured products generally have more flexible production processes, greater storage possibilities and greater unused capacity, allowing supply to respond more strongly to price changes.
(b) Answer:
An indirect tax is a tax imposed on spending on goods and services, such as a specific tax per unit or an ad valorem tax. An increase in an indirect tax increases firms’ costs of supplying the product and therefore affects the price, quantity traded, government revenue and the welfare of different stakeholders.
Effect on the market
An increase in an indirect tax shifts the supply curve to the left/upward because the cost of supplying each unit increases. The new market equilibrium results in a higher price paid by consumers and a lower quantity traded.
The extent to which consumers and producers bear the tax depends on the relative PED and PES. If demand is relatively inelastic, consumers are less responsive to the higher price and are likely to bear a larger proportion of the tax. If demand is relatively elastic, producers may bear a greater proportion because a large increase in price would cause a substantial fall in quantity demanded.
Similarly, if supply is relatively inelastic, producers have less ability to reduce quantity supplied and may bear a greater proportion of the tax. Therefore, the incidence of the tax depends on the relative responsiveness of both consumers and producers.
Effect on consumers
Consumers generally lose from an increase in indirect tax because the price they pay increases and the quantity available for consumption decreases. This reduces consumer surplus.
For example, when governments increase taxes on cigarettes, the retail price increases. Consumers who continue purchasing cigarettes have less disposable income available for other goods and services, while some consumers may reduce their consumption.
The impact on consumers may be particularly significant when the tax is imposed on a necessity or a product for which demand is relatively inelastic.
Effect on producers
Producers may experience a reduction in revenue and profit because the tax increases their costs and reduces the quantity sold. Firms may absorb part of the tax rather than passing the entire amount on to consumers, particularly when demand is price elastic.
For example, an increase in taxation on fuel can increase the costs of petrol stations and other firms in the fuel supply chain. If firms cannot fully pass the tax on to consumers, their profit margins may fall.
Effect on workers
Workers may be affected if firms respond to lower sales and higher costs by reducing production. Firms may reduce working hours, slow recruitment or make workers redundant. The effect is likely to be stronger in industries where demand is highly responsive to price and the tax causes a substantial fall in output.
Effect on government
The government gains tax revenue from the indirect tax. The amount of revenue depends on the tax rate and the quantity of the good sold after the tax.
If demand is relatively inelastic, quantity demanded falls by a relatively small percentage following the increase in price. Therefore, the government may collect substantial revenue. If demand is highly elastic, the quantity demanded may fall considerably, limiting the increase in tax revenue.
Effect on resource allocation and allocative efficiency
An indirect tax can improve resource allocation when the taxed good creates a negative externality. For example, taxes on petrol and cigarettes can attempt to reflect some of the external costs associated with pollution or healthcare costs.
If the tax is correctly set to reflect the marginal external cost, it can move the market closer to the socially optimal level of output and improve allocative efficiency. However, accurately measuring the external cost is difficult, so the tax may be set too high or too low.
Real-world example: tobacco taxation
Governments have increased taxes on tobacco products to reduce smoking and generate government revenue. Because demand for cigarettes is relatively inelastic, the higher tax can raise significant revenue while reducing consumption to some extent. However, the relatively inelastic demand means that the fall in consumption may be smaller than the government would desire.
Real-world example: fuel taxation
Higher fuel taxes can increase the price of petrol and diesel, reducing demand and encouraging more efficient use of fuel. This can help address negative externalities such as congestion and pollution. However, higher fuel prices also increase transportation and production costs for businesses and can contribute to higher prices throughout the economy.
Regressive effects
Indirect taxes can be regressive because lower-income households may spend a larger proportion of their income on taxed necessities. An increase in the tax can therefore place a relatively greater financial burden on poorer households.
For example, a higher tax on fuel can disproportionately affect low-income households that rely on cars for commuting and have limited ability to switch to alternative forms of transport.
Macroeconomic consequences
A significant increase in indirect taxes can contribute to cost-push inflation because firms face higher production costs and may increase prices. If the tax applies to widely used inputs such as energy or fuel, the effects can spread throughout the economy.
However, if the tax reduces consumption and aggregate demand sufficiently, it could also reduce demand-pull inflation. The overall macroeconomic effect therefore depends on the size and nature of the tax and the state of the economy.
The type and size of the tax also matter. A specific tax imposes a fixed amount per unit, whereas an ad valorem tax is a percentage of the price. A large increase in either type can create a much larger effect on prices, output and stakeholder welfare than a small increase.
Overall evaluation: An increase in indirect tax generally raises the consumer price, lowers quantity traded and creates government revenue. Consumers and producers are likely to lose some surplus, while the government gains revenue. Workers may also be affected if firms reduce production and employment.
However, the consequences depend heavily on PED and PES, the size and type of the tax, the nature of the good and whether the tax is designed to correct a market failure. Where a negative externality exists, taxation can improve allocative efficiency by reducing overconsumption. However, the tax may be regressive and can create inflationary pressure if it significantly raises production costs.
Therefore, an increase in indirect tax can improve social welfare when it is targeted at goods generating significant external costs, but its overall consequences for stakeholders depend on the responsiveness of demand and supply and the government’s objectives.