OCR A-Level Economics: Microeconomics (H460)

This guide covers Component 1 Microeconomics, examined as H460/01, one of three equally weighted components (each 33.33% of the award) in OCR A Level Economics (H460), for first teaching from 2019. From a base of microeconomic theory, this component develops students’ ability to discuss and evaluate how well microeconomic theories explain the behaviour of economic agents in the real world.

Where this fits in H460

Microeconomics builds understanding of markets, market structures and business objectives from first principles, while developing the quantitative and evaluative skills – interpreting data, considering the limitations of evidence, and weighing moral, ethical and sustainability issues – that are assessed throughout the paper.

Syllabus coverage

OCR A-LEVEL ECONOMICS (H460) — COMPONENT 1 MICROECONOMICS

• 1. Introduction to microeconomics — 1.1 the economic problem (economic and free goods; scarcity, choice, needs and wants; normative and positive statements; economic agents; the factors of production and their rewards); 1.2 the allocation of resources (incentives; market, planned and mixed economic systems; productive and allocative efficiency); 1.3 opportunity cost (trade-offs and the production possibility curve)
• 2. The role of markets — 2.1 specialisation and trade; 2.2 demand; 2.3 supply; 2.4 consumer and producer surplus; 2.5 the interaction of markets; 2.6 elasticity (PED, YED, XED and PES); 2.7 the concept of the margin; 2.8 market failure and externalities; 2.9 information failure (including asymmetric information, moral hazard, and merit and demerit goods); 2.10 public goods; 2.11 government intervention (including government failure)
• 3. Business objectives — 3.1 business objectives (maximising and non-maximising objectives, and the principal-agent problem); 3.2 costs and economies of scale (including the law of diminishing returns and minimum efficient scale); 3.3 revenue and profit (accounting, normal and supernormal profit)
• 4. Market structures — 4.1 perfect competition; 4.2 monopoly (including dynamic efficiency, X-inefficiency, price discrimination and natural monopoly); 4.3 monopolistic competition; 4.4 oligopoly (including the kinked demand curve, collusion and concentration ratios); 4.5 contestable markets
• 5. The labour market — 5.1 demand for labour (derived demand, wage elasticity of demand, and marginal revenue product theory); 5.2 supply of labour (including economic rent and transfer earnings); 5.3 the interaction of labour markets (wage differentials, monopsony, trade unions and bilateral monopoly)

The study notes below concentrate on the core models of sections 2-5. They do not cover every item in this map: use the specification itself to check topics such as price discrimination, natural monopoly, the kinked demand curve, economic rent, monopsony, trade unions and bilateral monopoly.

How to approach it

Introduction to microeconomics (Section 1) sets the reasoning pattern for the whole component – scarcity forces choice, and every choice carries an opportunity cost – so make this logic automatic before moving on, since it is assumed without re-explanation in every later section. The role of markets (Section 2) is the most diagram-heavy section: fluency in drawing and correctly labelling demand and supply diagrams, and explaining shifts along and of the curves, underpins almost everything that follows in Sections 3-5. Because the paper explicitly rewards evaluation of real-world economic behaviour, not just description of theory, practise applying each microeconomic model to a real or plausible market example and critically reflecting on the model’s assumptions and limitations.

Official syllabus

OCR A Level Economics (H460) specification, for first teaching from 2019 — ocr.org.uk.

Demand, supply and the price mechanism

Demand slopes downward because of the income and substitution effects; supply slopes upward because higher prices make production more profitable and cover rising marginal costs.

Distinguish carefully between a movement along a curve, caused only by a change in the good’s own price, and a shift of the curve, caused by anything else — income, tastes, substitutes and complements, population for demand; costs, technology, taxes, subsidies, number of firms for supply.

The price mechanism performs three functions: it signals where resources are wanted, it incentivises producers to respond, and it rations scarce goods to those willing to pay.

Elasticity

PED = % change in quantity demanded / % change in price
YED = % change in quantity demanded / % change in income
XED = % change in quantity demanded of A / % change in price of B
PES = % change in quantity supplied / % change in price

PED is negative; determinants are substitutes, necessity, proportion of income, and time. Its practical value is the link to revenue: where demand is inelastic, raising price raises total revenue; where elastic, it lowers it.

YED distinguishes normal goods (positive), luxuries (greater than 1) and inferior goods (negative). XED is positive for substitutes and negative for complements.

Consumer and producer surplus, and the margin

Consumer surplus is the difference between what consumers are willing to pay and what they actually pay, shown as the area below the demand curve and above the price. Producer surplus is the difference between what producers actually receive and the minimum they would accept, shown as the area above the supply curve and below the price. Total welfare is maximised where the two are jointly greatest, which is at the free-market equilibrium in the absence of market failure.

Economic decisions are made at the margin: a rational consumer keeps buying one more unit as long as the marginal benefit exceeds the marginal cost, and a rational firm keeps producing one more unit as long as marginal revenue exceeds marginal cost. This marginal reasoning underpins both consumer choice and the profit-maximising output rule (MC = MR) used in market structures below.

Market failure

Market failure occurs when the free market misallocates resources.

• Externalities — costs or benefits falling on third parties. Where negative externalities in production exist, marginal social cost exceeds marginal private cost and the market over-produces. Where positive externalities in consumption exist, as with education or vaccination, the market under-consumes.
• Public goods — non-rival (or non-diminishable), non-excludable, non-rejectable, and with zero marginal cost of an extra user; the free-rider problem means they are typically under-provided or not provided at all by a pure free market. Goods with only some of these characteristics, such as a toll road, are quasi-public goods.
• Merit and demerit goods — under- and over-consumed because of imperfect information about long-term effects.
• Information gaps and monopoly power complete the standard list.

Government intervention and its limits

Indirect taxes internalise external costs, subsidies encourage positive externalities, regulation and minimum or maximum prices constrain outcomes directly, and tradable permits create a market in the externality itself.

Every one of these carries the risk of government failure: imperfect information, unintended consequences such as black markets under a maximum price, administrative cost, and regulatory capture. A strong evaluation always weighs the intervention against this possibility rather than assuming it works.

Business objectives, costs and revenue

Firms may pursue profit maximisation (where MC = MR), sales/revenue maximisation (where MR = 0), or satisficing (an acceptable, rather than maximum, profit, often because ownership is separated from control). Total cost = fixed cost + variable cost; average cost = total cost ÷ output. Economies of scale — purchasing, technical, financial, managerial and marketing — reduce long-run average cost as output rises; beyond the minimum efficient scale, diseconomies of scale (chiefly problems of communication and coordination) raise it again. Total revenue = price × quantity; profit = total revenue − total cost.

Market structures

Market structures are distinguished by the number of firms, barriers to entry, and the degree of product differentiation:

• Perfect competition — many small firms, identical products, free entry and exit, perfect information; firms are price takers.
• Monopolistic competition — many firms, differentiated products, low barriers to entry; some price-setting power but normal profit in the long run.
• Oligopoly — a few large firms dominate the market (a high concentration ratio), interdependent pricing decisions, and non-price competition.
• Monopoly — a single dominant firm with high barriers to entry, able to restrict output and sustain price above the competitive level and earn supernormal profit.
• Contestable markets — markets with low barriers to entry and exit (low sunk costs), where the threat of “hit and run” entry can force even a dominant incumbent to behave competitively.

The concentration ratio measures the combined market share of the largest firms in an industry (e.g. a three-firm concentration ratio sums the market shares of the three largest firms) and is used to judge how close a market is to oligopoly or monopoly.

The labour market

Wages and employment are determined by the demand for labour (derived from the demand for the good or service labour produces, and dependent on labour’s marginal revenue product) and the supply of labour (influenced by wages, non-monetary rewards, qualifications and barriers to entry into an occupation). The equilibrium wage clears the labour market where labour demand equals labour supply, exactly as in a product market.

Worked example

A good has PED of -0.4. A firm raises price by 10%. What happens to revenue?

% change in Qd = PED x % change in P = -0.4 x 10 = -4%

Price   +10%
Quantity -4%
Revenue changes by roughly +10 - 4 = +6%

Demand is inelastic, so the price rise more than offsets the fall in quantity and revenue increases — which is why firms selling necessities, and governments taxing them, behave as they do.

Common mistakes

Describing a change in the good’s own price as shifting the demand curve. Omitting the minus sign on PED, or misreading it as elastic. Confusing merit goods with public goods — merit goods are both rival and excludable. Saying a negative externality means the market “produces too little”. Recommending intervention without evaluating government failure.

Quick revision checklist

• Explain the shape of demand and supply curves and distinguish movements from shifts.
• State the three functions of the price mechanism.
• Calculate and interpret PED, YED, XED and PES, and link PED to total revenue.
• Explain each type of market failure with a diagram showing the welfare loss.
• Evaluate interventions, including the risk of government failure.