Edexcel A Level Economics: Markets in Action (WEC11/01)

This guide covers Unit 1 Markets in action (unit code WEC11/01), an AS Level unit for Pearson Edexcel International Advanced Subsidiary/Advanced Level Economics, Specification Issue 2. The qualification is divided into units, not topics: WEC11/01 is the entry code for this unit’s own assessment, while XEC11 is the cash-in code for the overall International Advanced Subsidiary award and YEC11 is the cash-in code for the overall International Advanced Level award.

Where this fits in the qualification

Markets in action is the first unit candidates meet, and it builds the core microeconomic toolkit — demand, supply, price determination, and the reasons markets can fail — that later units on business economics and government policy both assume and apply to more specific situations.

Syllabus coverage

PEARSON EDEXCEL INTERNATIONAL A LEVEL ECONOMICS — UNIT 1 (WEC11/01) MARKETS IN ACTION

• 1.3.1 Introductory concepts — scarcity, choice, opportunity cost and the basic economic questions every economy must answer
• 1.3.2 Consumer behaviour and demand — the factors influencing demand, and price, income and cross elasticities of demand
• 1.3.3 Supply — the factors influencing supply, and price elasticity of supply
• 1.3.4 Price determination — how demand and supply interact to determine market price, and the effect of shifts in either curve
• 1.3.5 Market failure — the reasons markets can fail to allocate resources efficiently, including externalities and public goods
• 1.3.6 Government intervention in markets — the methods governments use to intervene in markets, and their effectiveness (indirect taxes, subsidies, price controls, and direct government provision of goods and services)

Markets in action (Unit 1, WEC11/01) is examined by a single paper of 1 hour 45 minutes, worth 80 marks across four sections, sat alongside Unit 2 (Macroeconomic performance and policy, WEC12/01) as part of the International Advanced Subsidiary award (XEC11) — together the two units form the complete AS-level content, with Unit 1 worth half of the International Advanced Subsidiary award and a quarter of the full International Advanced Level award (YEC11). The specification sets no cross-unit drawing for Unit 1 (or Unit 2); it is the two International A2 units that draw on earlier units: Unit 3 questions ‘may draw on any content covered in Units 1 and 2’, and Unit 4 questions on any content covered in Units 1, 2 and 3.

How to approach it

This unit rewards fluency drawing and interpreting demand-supply diagrams above almost everything else, since every one of its six sub-topics eventually gets expressed through one — practise sketching a diagram from a blank page for each type of scenario (a shift in demand, a price ceiling, a negative externality) until the process is automatic. Labelling axes, curves, the equilibrium point, and any shift arrows precisely is not a cosmetic detail — Edexcel’s mark schemes typically allocate specific marks to correctly labelled diagram components, separate from the marks for the accompanying written explanation. Elasticity (1.3.2–1.3.3) needs both calculation fluency and the ability to explain, in economic terms, what a given elasticity value means for pricing or tax-incidence decisions — both skills are tested separately. For market failure and government intervention (1.3.5–1.3.6), the strongest answers evaluate a specific intervention’s effectiveness for a specific type of market failure, rather than describing interventions in the abstract, since AS Level Economics essay questions consistently reward applied evaluation over generic description.

Working through the six sub-topics in sequence

The six sub-topics build cumulatively rather than standing independently. 1.3.1’s opportunity-cost and scarcity framework underlies every subsequent diagram; 1.3.2 and 1.3.3 establish demand and supply separately before 1.3.4 combines them into price determination; and only once equilibrium (1.3.4) is secure does 1.3.5’s market failure make sense, since “failure” is defined relative to the efficient outcome a competitive market would otherwise produce. 1.3.6 then closes the unit by asking what governments can do about the failures identified in 1.3.5 – so a weak grasp of 1.3.5 tends to surface directly as difficulty evaluating 1.3.6’s specific interventions (why a subsidy addresses a positive externality but a tax addresses a negative one, for instance).

Elasticity calculations worth practising to automaticity

Three elasticity formulas recur throughout 1.3.2-1.3.3 and then again in later units: price elasticity of demand (% change in quantity demanded ÷ % change in price), income elasticity of demand (% change in quantity demanded ÷ % change in income), and price elasticity of supply (% change in quantity supplied ÷ % change in price). Beyond calculating a numerical value, candidates need to interpret its sign and magnitude correctly – whether a good is normal or inferior (income elasticity), whether demand is elastic or inelastic (price elasticity of demand, which determines whether a price rise increases or decreases total revenue), and whether supply can respond quickly or slowly to a price change (price elasticity of supply, often linked to the time period and spare production capacity available). Because these interpretations, not just the arithmetic, are what essay-style questions actually test, calculation practice alone is not sufficient preparation.

Government intervention: the toolkit at a glance

Intervention	Typical use	How it works
Indirect tax	Reduce output of a good with negative externalities	Shifts supply curve left (up), raising price and reducing quantity
Subsidy	Increase output of a good with positive externalities	Shifts supply curve right (down), lowering price and raising quantity
Price ceiling	Keep a good affordable (e.g. rent controls)	Legal maximum price below equilibrium — risks causing a shortage
Price floor	Protect producers (e.g. minimum wage, agricultural prices)	Legal minimum price above equilibrium — risks causing a surplus
Direct provision	Supply a public good the market under-provides	Government supplies the good itself, funded through taxation

Evaluative essay answers on 1.3.6 consistently reward identifying which specific market failure an intervention is meant to correct, and then weighing its likely side-effects (a price ceiling risking a shortage, a subsidy’s opportunity cost to the government budget) against its intended benefit, rather than describing the intervention in the abstract.

Official syllabus

Pearson Edexcel International Advanced Subsidiary (XEC11) / Advanced Level (YEC11) Economics specification, Unit 1 Markets in action (WEC11/01), Issue 2, June 2018 — qualifications.pearson.com.