IBDP Economics 2.2 Supply SL Paper 1 - New Syllabus
Question
(a) Explain two non-price determinants that could increase the market supply of a good. [10]
(b) Using real-world examples, evaluate whether the provision of subsidies will always be beneficial. [15]
Most-appropriate topic code (CED):
• TOPIC 2.7: Role of government in microeconomics
▶️ Answer/Explanation
(a) Answer:
Market supply refers to the total quantity of a good that all firms in a market are willing and able to supply at different prices over a given period of time. A non-price determinant of supply is a factor other than the price of the good itself that causes the entire supply curve to shift.
1. A decrease in the costs of factors of production
Factors of production include land, labour, capital and entrepreneurship. If the costs of these factors decrease, firms can produce the good at a lower cost. This increases the profitability of supplying the good, so firms are willing and able to supply a greater quantity at every possible price.
For example, if the price of a raw material used to manufacture a product decreases, firms’ production costs will fall. At the existing market price, firms can now earn a higher profit per unit and therefore have an incentive to increase output. This causes market supply to increase and the supply curve to shift rightward from \(S_1\) to \(S_2\).
2. An increase in subsidies
A subsidy is a payment made by the government to producers that lowers their effective cost of production. When the government increases a subsidy, firms receive financial support for each unit produced or for their production activities. This reduces their effective production costs and increases the profitability of supplying the good.
As a result, firms are willing and able to supply a greater quantity at each possible price. Market supply therefore increases, represented by a rightward shift of the supply curve.
For example, if the government provides subsidies to agricultural producers, farmers may face lower effective production costs. This can encourage them to increase the quantity of agricultural products supplied to the market.
An increase in market supply is shown by the entire supply curve shifting rightward from \(S_1\) to \(S_2\). This differs from an increase in quantity supplied, which would be shown by a movement along the same supply curve caused by an increase in the price of the good.
Therefore, lower factor costs and increased subsidies can both increase market supply because they reduce firms’ effective costs and increase their willingness and ability to produce.
(b) Answer:
A subsidy is a payment made by the government to producers or consumers that lowers the effective cost of producing or purchasing a good or service. Producer subsidies reduce firms’ costs of production and can encourage an increase in supply. However, whether subsidies are beneficial depends on their purpose, size, effectiveness and opportunity cost. Therefore, they are not always beneficial.
One benefit of subsidies is that they can lower production costs and increase supply. A subsidy to producers reduces their effective costs, shifting the supply curve to the right. This leads to a lower market price and a greater equilibrium quantity. Consumers therefore benefit from lower prices and increased availability of the good.
At the same time, producers may benefit because their revenue and profitability can increase. The subsidy can therefore encourage firms to expand production and may support employment in the subsidized industry.
For example, governments may provide subsidies to renewable energy producers to reduce the cost of producing solar or wind energy. Lower production costs can increase the supply of renewable energy and make it more competitive with fossil-fuel-based energy.
Subsidies can also be used to encourage consumption of merit goods. Merit goods are goods that are considered socially beneficial and may be underconsumed if individuals consider only their private benefits. Subsidizing goods such as education, healthcare or vaccinations can lower their effective price and increase consumption.
For example, governments may subsidize vaccinations to increase uptake. The private benefit to an individual is not the only benefit because widespread vaccination can reduce the transmission of infectious diseases to other people. The subsidy can therefore help increase consumption and generate positive external benefits.
Subsidies can also be used to support industries considered strategically important. For example, governments may subsidize domestic agriculture to support food production and food security. This may be particularly important where a country wants to reduce dependence on imported food.
However, subsidies involve a significant opportunity cost. Government funds are limited, so money spent subsidizing one industry cannot be spent elsewhere. For example, funds used to subsidize energy production could instead have been used for healthcare, education or infrastructure.
Therefore, a subsidy is only beneficial if the benefits generated by the subsidized activity are greater than the benefits that could have been obtained from the government’s next-best alternative use of the funds.
Subsidies may also require higher taxes or increased government borrowing. If the government finances subsidies by increasing taxation, households and firms may have less disposable income available for consumption and investment. Alternatively, if the government borrows to finance the subsidy, it may increase public debt and create future financial obligations.
Another disadvantage is the possibility of producer inefficiency. If firms receive subsidies for a long period, they may become dependent on government support. This can reduce the incentive to lower costs, innovate or improve productivity. Inefficient firms may remain in the market even when they would not survive without government assistance.
This means that although a subsidy can increase supply in the short run, it may reduce productive efficiency in the long run if firms have little incentive to become more competitive.
There may also be a welfare loss if subsidies are poorly targeted. If a subsidy causes output to expand beyond the socially optimal level, the additional cost to the government and society may exceed the additional benefits generated by the extra output. In this situation, the subsidy can result in an inefficient allocation of resources.
The size of the subsidy is therefore important. A subsidy that is appropriately targeted at correcting a market failure may improve economic welfare, while an excessively large subsidy may create unnecessary government expenditure and overproduction.
Subsidies can also create equity issues. The benefits may disproportionately go to producers or consumers in particular industries rather than to society as a whole. For example, a subsidy to large agricultural producers may provide significant benefits to those firms while smaller producers or taxpayers bear part of the cost.
There can also be international consequences. If a government heavily subsidizes domestic producers, those firms may be able to sell goods at lower prices than otherwise possible. This can distort international competition and may lead to disputes with trading partners over unfair competition.
Real-world example: Subsidies for renewable energy can generate substantial benefits because they encourage investment in technologies with potentially positive environmental effects. They can help increase the supply of renewable energy and reduce dependence on fossil fuels. However, if subsidies are maintained for inefficient technologies or are set too high, they can impose substantial costs on governments and taxpayers without generating benefits large enough to justify the expenditure.
Overall evaluation: Subsidies can be highly beneficial when they correct a market failure, encourage the consumption of merit goods, support activities with positive externalities or help strategically important industries. In these cases, the social benefits can exceed the cost of government intervention.
However, subsidies are not always beneficial. Their opportunity cost, financing requirements, potential to create producer inefficiency, equity effects and possibility of welfare loss must be considered. The effectiveness of a subsidy also depends on how responsive producers and consumers are to changes in price and costs.
Therefore, the word “always” is crucial. Subsidies should not automatically be regarded as beneficial. They are most desirable when they are carefully targeted at a clearly identified market failure or social objective and when the resulting benefits exceed the government’s opportunity cost. Poorly designed or excessive subsidies may instead reduce economic efficiency and place an unnecessary burden on taxpayers.
Question
(a) Explain how one determinant of demand might lead to a decrease in the price of wheat and how one determinant of supply might lead to an increase in the price of wheat. [10]
(b) Using real-world examples, evaluate the view that price floors (minimum prices) should never be used. [15]
Most-appropriate topic code (CED):
• TOPIC 2.2: Supply – part (a)
• TOPIC 2.7: Role of government in microeconomics – part (b)
▶️ Answer/Explanation
(a) Answer:
Demand refers to the quantity of a good that consumers are willing and able to purchase at different prices, while supply refers to the quantity that producers are willing and able to sell at different prices, ceteris paribus.
One determinant of demand that could reduce the price of wheat is a fall in consumers’ incomes. Assuming wheat is a normal good, a fall in income reduces consumers’ ability and willingness to purchase wheat.
This causes a decrease in demand, represented by a leftward shift of the demand curve from D1 to D2. At the original equilibrium price, there is now excess supply because producers are willing to supply more wheat than consumers are willing to purchase.
To eliminate this surplus, producers reduce their prices. The market therefore moves to a new equilibrium with a lower price and a lower equilibrium quantity of wheat.
Therefore, assuming wheat is a normal good, a fall in income can lead to a decrease in demand and hence a decrease in its equilibrium price.
One determinant of supply that could increase the price of wheat is an increase in the costs of factors of production, such as fertilizer, fuel or labour.
Higher production costs reduce the profitability of producing wheat at each possible price. Producers are therefore willing and able to supply less wheat, causing the supply curve to shift left from S1 to S2.
At the original equilibrium price, there is now a shortage because the quantity demanded exceeds the quantity supplied. Consumers compete for the reduced quantity available, putting upward pressure on the price.
The market reaches a new equilibrium with a higher price and a lower equilibrium quantity of wheat.
A demand and supply diagram can show the leftward shift of the demand curve resulting in a lower equilibrium price. A second diagram can show the leftward shift of the supply curve resulting in a higher equilibrium price.
Thus, a decrease in a determinant of demand such as income can reduce the price of wheat, while an increase in a determinant of supply such as production costs can increase its price. The two changes operate through shifts in the demand and supply curves respectively.
(b) Answer:
A price floor, or minimum price, is a legally established minimum price below which a good or service cannot be sold. For a price floor to have an effect, it must normally be set above the equilibrium price.
The argument that price floors should never be used is based on their potential to create market inefficiency and negative effects for consumers, producers and governments.
When an effective price floor is imposed above the equilibrium price, the higher price encourages producers to increase the quantity supplied while discouraging consumers from purchasing the good. This creates a surplus, because quantity supplied exceeds quantity demanded.
Diagram: A price-floor diagram should show the minimum price above the equilibrium price, with quantity supplied greater than quantity demanded. The resulting surplus represents the excess supply created by the intervention.
A major problem is that producers may be unable to sell all of their output at the minimum price. If the government promises to purchase the surplus, it must buy the excess output, creating a government expenditure.
This creates an opportunity cost. Government resources spent purchasing surplus goods cannot be used for other priorities such as healthcare, education or infrastructure.
Price floors can also cause resource misallocation. The artificially high price signals producers to increase production even though consumers are not willing to purchase the additional output. Resources may therefore remain in an industry where they could be used more efficiently elsewhere.
Producers may also become dependent on government support. If farmers expect the government to maintain a minimum price, they may have weaker incentives to reduce costs or respond efficiently to changing market conditions.
Consumers are generally worse off when an effective price floor raises the market price. Consumers who continue to purchase the good pay a higher price and experience a reduction in consumer surplus.
A price floor can therefore generate negative welfare effects if the costs imposed on consumers, taxpayers and society exceed the benefits received by producers.
Agricultural price supports provide a real-world example. Governments in some countries have historically supported agricultural producers through minimum prices and related intervention policies. Such policies can increase farm incomes but may also create surpluses and require significant government expenditure.
However, the claim that price floors should never be used is too strong because price floors can achieve important economic and social objectives.
One possible benefit is income support for agricultural producers. Agricultural markets can experience large fluctuations in prices because supply may depend on weather and demand may be relatively price inelastic.
A minimum price can provide farmers with greater income stability and protect them from exceptionally low market prices. This may be particularly important where farming provides employment and income for a large proportion of the population.
Price floors may also be used to protect domestic producers from low-cost competition. A government may attempt to maintain a minimum return for domestic producers where it considers the industry strategically or socially important.
Another important application of price floors is the minimum wage. A minimum wage is a legally established minimum price for labour.
In a simple competitive labour-market model, a minimum wage set above the equilibrium wage may create a surplus of labour, meaning that the quantity of labour supplied exceeds the quantity demanded. This could create unemployment.
However, the actual impact depends on the structure of the labour market. Where employers possess significant monopsony power, a carefully set minimum wage can potentially increase both wages and employment by reducing the exploitation of workers’ bargaining disadvantage.
A higher minimum wage can also increase the incomes of low-paid workers. This may reduce income inequality and improve living standards for households dependent on low-wage employment.
For example, minimum-wage legislation in countries such as the United Kingdom has been used to establish a wage floor and raise the earnings of low-paid workers. Its effects on employment depend on the level at which the wage is set and the responsiveness of employers’ demand for labour.
Price floors may also be used to discourage the consumption of a demerit good. If the government establishes a minimum price for products such as alcohol, the higher price may reduce consumption and help address negative effects associated with excessive consumption.
In this case, the objective is not necessarily to maximize market efficiency but to improve social welfare by reducing consumption that generates social costs.
The effectiveness of a price floor also depends on the availability of alternative policies. For example, agricultural incomes could potentially be supported through direct income payments rather than maintaining a minimum market price.
Direct payments may provide income support while avoiding some of the market distortions associated with artificially high prices. However, they still involve government expenditure and therefore have an opportunity cost.
Similarly, governments could use education, training and other labour-market policies instead of relying entirely on minimum wages to improve the incomes and employment prospects of low-paid workers.
The desirability of a price floor therefore depends on the objective of the policy and the conditions in the market. A price floor designed simply to maintain producer prices may create significant surpluses and inefficiency, whereas a carefully designed minimum wage may improve equity without causing substantial unemployment.
The word “never” is therefore particularly important. Economic policy rarely produces the same outcome in every market. The effects of a price floor depend on its level, the elasticity of demand and supply, the structure of the market and the government’s ability to manage unintended consequences.
Overall evaluation: Price floors can create serious problems when they are set above the market equilibrium. They can generate surpluses, raise prices for consumers, create government expenditure, distort resource allocation and reduce economic efficiency.
Nevertheless, it would be incorrect to conclude that price floors should never be used. They can provide income support to farmers, protect vulnerable workers, reduce inequality and, in certain circumstances, discourage consumption of demerit goods.
The strongest judgement is that price floors should be used only when the social or distributional benefits justify the resulting market distortion. They are more defensible when targeted at a clear market or social problem and when the government considers the costs and possible alternatives.
Therefore, price floors are not inherently beneficial or harmful. Their success depends on the specific objective, the level of the minimum price, market conditions and the effectiveness of complementary policies. The claim that they should never be used is consequently not justified.