Demand and Supply Notes

H2 Economics Chapter 2 Notes This document is intended as a summary of the points provided in the NJC 2024 H2 Economics Chapter 2 Seminar Notes. It is to be used as a study guide to provide a structure for studying the Chapter 2 Notes. 1 The Free Market Economy The Free Market Economy In Chapter 1, we studied scarcity as the central economic problem, where unlimited wants exceed limited resources, necessitating decisions on resource allocation to maximise societal welfare. We briefly touched on how rational agents weigh benefits and costs to make decisions that enhance welfare. In Chapter 2, we delve into how this process unfolds in a free market economy. Below are the features of a free market economy 1 . ● Freedom of Choice and Enterprise: Households and firms undertake all decisions. Consumers are free to decide what to buy with their incomes (consumer sovereignty). Workers are free to choose where and how much to work. Firms are free to choose what to sell and what production methods to use. ● Pursuit of Self-Interest: Economic activity in the free market system is driven solely by self-interest. Each economic agent hence attempts to maximise their net private benefit. Hence, firms try to maximise profits, consumers try to maximise satisfaction and workers try to get jobs that yield as high a return as possible and governments aim to maximise societal welfare. ● Perfect Competition: Competition here refers primarily to price competition. This means that in the market for each commodity, there are a large number of buyers and sellers, each having an insignificant share of the market and hence having negligible influence on the market demand and supply. No single buyer or seller is influential enough to control a market and exploit other sellers or buyers. ● Private Ownership of Property: Households have the right to own labour, land, capital and entrepreneurship resources. Owners of factors of production thus have the right to the income (wages, rent, interest and profits respectively) earned from firms’ use of these factors of production. 1 The other types of economy are the command economy — in which the allocation of resources is entirely determined by the government — and the mixed economy — in which the allocation of resources is determined primarily by the free market, with government intervention in market failure (which will be covered in Chapter 4). The features of these economies are not necessary. 1

NJC H2 Economics 2024 Chapter 2 Adam Smith argued that under this set of assumptions, resources will be allocated perfectly to produce a combination of goods and services in society which maximises societal welfare. But why is this so? The interactions between demand and supply create a ‘tug-of-war’ dynamic which allows resources to be allocated in a manner that corresponds to the relative magnitude of the willingness and ability of consumers to buy and the producers to sell goods and services. Below are the core functions of the price mechanism in providing for allocative efficiency 2 . Signalling: The price level acts as a signal to producers reflecting what is relatively scarce and what is relatively abundant. The price offered by consumers is an indication of the valuation of the goods by the consumers in preference to other goods . Hence, an increase in the equilibrium price of good A will indicate to producers that consumers’ valuation of good A has increased and they are willing to see resources diverted away from the production of other goods and towards the production of good A, signalling to producers that they should allocate more resources to good A to increase their quantity supplied to meet the higher quantity demanded. The higher price also indicates to individual consumers to reduce their quantity demanded. Incentive: Changes in price provide incentives for producers to reallocate their scarce resources. For example, when there is an increase in price of good A, profit-maximising firms are incentivised to divert their resources away from goods with a lower price relative to their cost of production towards good A with a higher price to capture the potentially higher revenue from the sale of the additional unit of goods and services, which, holding costs constant, would hence result in higher profits . Hence, more resources will be allocated to the production of a good in response to higher prices. Hence, the signalling and incentive functions of the price mechanism address what and how much to produce . The higher price also means consumers’ purchasing power for the good has decreased, which incentivises individual consumers seeking to maximise their level of satisfaction to divert their income away from the purchase of good A which has a higher cost relative to the satisfaction it provides and towards goods which have a lower cost relative to the satisfaction they provide. Hence, quantity demanded will decrease in response to a rise in price. 2 There are greyed out sections which are largely for understanding. These should not be written in answers. This is because they explain the function of the price mechanism from the consumers’ point of view. However, the syllabus states it is only required to know how the price mechanism addresses the questions of what to produce, how to produce and for whom to produce. From this, the focus of the price mechanism function is on the producer side. 2

NJC H2 Economics 2024 Chapter 2 Rationing: Changes in price enable scarce resources to be rationed to consumers based on their willingness and ability to pay. For example, as the price is bidded up, consumers who are less willing or less able to pay will leave the market and not purchase these goods, decreasing the quantity demanded. On the other hand, profit-maximising producers are more willing and able to sell to consumers who pay the most so they enter the market and sell these goods, increasing the quantity supplied. Hence, consumers who are most willing and able to pay will offer more dollar votes to indicate that they have the greatest valuation for these goods and services, so goods are preferentially allocated to them. On the other hand, producers who are most willing and able to sell