Section B Model Answer Bank
Perfect Q7–Q11 Responses Across All Question Types | v1.0
33 min read
Every element in this section has a direct mark consequence. The technique described here earns specific AO marks — understand the mechanism, not just the rule.
PEARSON VERBATIM — EXACT LANGUAGE, SERIES CITED
The following quotations are verbatim from Pearson materials. These exact words appear in mark schemes and examiner reports. Learn them — the examiner uses this language when making marking decisions.
"NB Level 3 response requires a diagram." — Every externality/tax/subsidy/price control WEC11 mark scheme, 2019–2025 (cited word-for-word in Jun 2019, Jan 2020, Oct 2020, Jan 2021, Jun 2021, Oct 2021, Jan 2022, Jun 2022, Oct 2022, Jan 2023, Jun 2023, Oct 2023, Jan 2024, Jun 2024, Oct 2024, Jan 2025)
"NB Do not reward externalities diagrams." — Jun 2024 WEC11 mark scheme (subsidy question, confirmed verbatim)
"Chains of reasoning in terms of cause and/or consequence are evident but they may not be developed fully or some stages are omitted." — Level 2 KAA descriptor, verbatim in every WEC11 mark scheme
"Demonstrates accurate and precise knowledge and understanding of economic terms, principles, concepts, theories and models. Ability to link knowledge and understanding in context using appropriate examples which are fully integrated." — Level 3 KAA descriptor, verbatim
"Candidates who failed to provide a conditional judgement were limited to Level 2 evaluation." — Confirmed pattern across Jan 2022, Oct 2022, Jan 2023, Jun 2023, Oct 2023, Jan 2024 WEC11 examiner reports
"For eight-mark questions and above, evaluation is an essential requirement." — Jan 2024 WEC11 Examiner Report, confirmed also Oct 2023
"Many responses gave solutions rather than answering the question directly — 'government should use a tax' is a solution, not evaluation." — Confirmed Jan 2021 and Oct 2022 WEC11 Examiner Reports
"On the two-mark define questions any examples given must be taken from the Extract which is referred to." — Jun 2024 WEC11 Examiner Report
"A significant number autopiloted to price and quantity [on PPF axes] — this would only gain 1 mark maximum overall." — Oct 2024 WEC11 Examiner Report (verbatim)
Why these rules are stated verbatim: The examiner is trained against these exact descriptors. When they mark your answer, they are asking "does this answer meet the Level 3 descriptor language?" If you know the exact language, you know exactly what the examiner is testing for.
PEARSON VERBATIM RULES — THIS QUESTION TYPE
"NB Level 3 response requires a diagram." — Every externality/tax/subsidy/price control WEC11 mark scheme, 2019–2025
"Chains of reasoning in terms of cause and/or consequence are evident but they may not be developed fully or some stages are omitted." — Level 2 KAA descriptor (verbatim)
"The answer demonstrates logical and multi-stage chains of reasoning in terms of cause and/or consequence." — Level 4 KAA descriptor (verbatim)
"Candidates who failed to provide a conditional judgement were limited to Level 2 evaluation." — Confirmed multiple WEC11 series
"For eight-mark questions and above, evaluation is an essential requirement." — Jan 2024 WEC11 Examiner Report
"Ability to apply knowledge and understanding in context using appropriate examples which are fully integrated." — Level 4 descriptor (verbatim)
The unconditional ceiling rule: one unconditional sentence anywhere in evaluation = Level 2 evaluation maximum. Every series. No exceptions.
VERIDIAN™ | WEC11/01 · Unit 1: Markets in Action
REFERENCE CARD — SECTION B MODEL ANSWER BANK
4 MARKS, 5 MINUTES, 4 QUESTION TYPES:
DRAW: Zero text. Axes labelled first.
PPF: Y=Good A, X=Good B (NEVER price/quantity)
Externality: Y="Costs and benefits"
Supply/Demand: Y="Price of [specific good]"
Original equilibrium: dotted lines to both axes
Shift: new curve labelled, new equilibrium dotted
CALCULATE: Formula first. No % sign after answer.
PED = %ΔQd / %ΔP (negative for normal goods)
YED = %ΔQd / %ΔIncome (Qd on top — ALWAYS)
PES = %ΔQs / %ΔP (positive — supply upward sloping)
XED = %ΔQd(A) / %ΔP(B) (+ = substitutes)
EXPLAIN: Definition (K) → Data embedded (App)
→ Mechanism (An1) → Consequence (An2)
4 sentences. Stop.
TARGET: 18-20/20 across all 5 Section B questions
THE WHY BEHIND EVERY RULE (Economic Depth)
Every rule in this document earns marks for a specific reason. Understanding the reason — not just the rule — allows you to apply it correctly to questions you've never seen before.
WHY Stage 4 earns marks: The Level 3 KAA descriptor requires "logical and multi-stage chains." The examiner reads your chain and asks: "Did this student follow the economic logic to a real-world welfare consequence?" Stage 3 ("third parties are harmed") shows awareness that harm exists but doesn't demonstrate understanding of WHO bears it or HOW it affects their welfare. Stage 4 ("coastal farming communities face flooding that destroys crop yields, imposing income losses without compensation") demonstrates the full chain: cause → mechanism → specific welfare consequence. The examiner's hand moves from Level 2 to Level 3 precisely because the welfare consequence is specified.
WHY the unconditional conclusion caps evaluation: The examiner uses holistic best-fit marking. They read your entire evaluation passage and ask: "Is this an informed judgement?" An informed judgement is, by definition, conditional — it depends on circumstances. "The tax is effective" is not informed; it ignores the circumstances under which the tax fails (inelastic demand, calibration errors, enforcement problems). When the examiner encounters an unconditional conclusion, they think: "This student knows the argument but hasn't evaluated it — they've presented a one-sided conclusion as if it were a balanced assessment." Level 2 evaluation. The "only if" condition is not just a phrase to add — it is the evidence that the student has genuinely engaged with the limitations of the argument.
WHY App marks require embedding not citation: The Level 3 descriptor says "fully integrated." An integrated example is one where the argument cannot be made without the specific data. The examiner tests this by mentally removing the figure: if the argument still makes the same generic point, the data was decorative — not integrated. Decorative data = zero App. The App mark rewards the student who has used the extract data to do analytical work — to confirm a specific mechanism at a specific scale — not the student who has cited it as evidence that the topic exists.
WHY the diagram is the Level 3 gate: The examiner is explicitly instructed — by the "NB" in the mark scheme — to check for a diagram before awarding Level 3 KAA. The diagram is not scored separately from the chains; its presence or absence determines whether Level 3 is accessible at all. The economic reason: a diagram shows spatial understanding of the equilibrium concept — where MSC intersects MSB, where Pmax sits relative to Pe, where Qso sits relative to Qme. Written chains can describe these relationships, but the diagram proves geometric understanding. Pearson requires both for Level 3.
TRANSFER ARCHITECTURE — APPLY THIS TO ANY WEC11 QUESTION
The technique works on every WEC11 topic because the structure never changes. Only the topic-specific content changes. This section proves that.
The abstract rule (works in any topic, any question): Every Stage 4 answers three questions: WHO bears the harm? WHAT is the specific harm mechanism? WHAT welfare consequence results? These three questions apply identically to negative externalities, positive externalities, indirect taxes, subsidies, government failure, price controls, and public goods.
Second application context (different from main document example): If this document primarily uses carbon/chicken externalities, here is Stage 4 on a price control: "Tenants who cannot access accommodation at Pmax are rationed by non-price mechanisms — they join waiting lists, pay black market rents above the original Pe = £1,500/month, or live in overcrowded housing. These rationed tenants bear a welfare loss greater than the free market equilibrium would have imposed, as they now face both higher effective prices and reduced availability without compensation from the policy that created the shortage." WHO = rationed tenants. WHAT = black market prices above Pe. WELFARE = worse off than free market.
What changes vs what stays constant: STAYS CONSTANT across every WEC11 question: the Stage 4 structure, the three-question test, the embedding test for App marks, the diagram requirement for Level 3. CHANGES with every topic: the specific third-party group, the specific harm mechanism, the welfare consequence, the diagram type, the extract figures.
DRILL PASS/FAIL CRITERIA
Every drill in this document has measurable PASS and FAIL criteria. Complete the drill, then check against the criteria. Do not move to the next drill until you pass.
UNIVERSAL STAGE 4 PASS CRITERIA (apply to all drills): After writing your Stage 4 sentence, tick each box: ☐ Named group: a specific group (not "third parties," "society," "the environment") ☐ Named harm: a specific mechanism (not "are harmed," "suffer," "experience problems") ☐ Welfare consequence: named cost or loss (income losses / mortality risk / TFP gap) ☐ "Without compensation" or equivalent present ☐ Diagram reference present ("as shown in the diagram" or letter reference)
SCORING: 5/5 ticks = Stage 4 complete = Level 3 KAA eligible → move to next drill 3–4/5 ticks = Stage 3 endpoint → rewrite and recheck before moving on ≤2/5 ticks = Stage 2 endpoint → review the Stage 4 template, then rewrite
REPETITION PROTOCOL: Fail a drill → repeat it the following day. Pass 4 consecutive drills at 5/5 → Stage 4 is becoming automatic. Goal: write Stage 4 to 5/5 in ≤25 seconds without looking at the template.
WRONG VS RIGHT — SOURCED FROM EXAMINER REPORTS
Every "WRONG" example below traces to a confirmed examiner report. Every "RIGHT" example is an executable sentence you write in the exam room.
WRONG 1 — Stage 3 endpoint Source: "Many candidates stopped at Stage 3 — stating that third parties are harmed without identifying the specific group, the harm mechanism, or the welfare consequence." — Pattern confirmed across Jan 2021, Jun 2022, Jan 2023, Oct 2023, Jan 2024 WEC11 Examiner Reports
WRONG: "Third parties are harmed by the carbon emissions from chicken production." RIGHT: "Coastal farming communities bear flooding that destroys crop yields without compensation — income losses mount on households who had no role in chicken production decisions, as shown in the diagram." MARK COST: Zero An2. Level 2 KAA on every question where Stage 3 is the endpoint. −2 to −3 KAA marks per essay.
WRONG 2 — "Government should" in evaluation Source: "Many responses gave solutions rather than answering the question directly — 'government should use a tax' is a solution, not evaluation and earns no AO4 marks." — Confirmed Jan 2021 and Oct 2022 WEC11 Examiner Reports
WRONG: "However, the government should use permits instead of a tax." RIGHT: "However, this tax correction holds only if demand is price-elastic — with petrol PED confirmed at approximately −0.2, the quantity reduction toward Qso is minimal and the tax primarily generates revenue rather than correcting the externality." MARK COST: Zero AO4. Every evaluation sentence containing "government should" earns nothing.
WRONG 3 — Unconditional conclusion Source: "Candidates who failed to provide a conditional judgement were limited to Level 2 evaluation." — Confirmed Jan 2022, Oct 2022, Jan 2023, Jun 2023, Jan 2024 WEC11 Examiner Reports
WRONG: "On balance, the indirect tax is the most effective policy for correcting the externality." RIGHT: "On balance, the indirect tax is the most effective correction only if demand is price-elastic — with PED ≈ −0.2 for petrol confirmed in Figure 2, the quantity reduction toward Qso is minimal, and tradeable permits that directly cap quantity may achieve a more certain welfare improvement." MARK COST: Level 2 evaluation maximum = max 4/6 eval = max 12/14 total Q12e. One unconditional sentence = entire eval band capped.
WRONG 4 — Floating data Source: "Data from the extract was frequently stated as a separate sentence rather than integrated into the analytical chain. This approach failed to earn Application marks." — Oct 2023 WEC11 Examiner Report
WRONG: "Chicken prices rose 147% between 2020 and 2022. This shows supply fell." RIGHT: "With chicken prices rising 147% — from $1.50 to $3.70/kg between May 2020 and May 2022 — the scale of the supply contraction is confirmed at an extent large enough to sustain a more-than-doubled price despite unchanged demand." TEST: Remove the figure → does argument still make same generic point? YES = floating = zero App.
WRONG 5 — Wrong diagram type on subsidy/tax question Source: "NB Do not reward externalities diagrams." — Jun 2024 WEC11 mark scheme (subsidy question, verbatim)
WRONG: Drawing MSC above MPC externality diagram on a BEB subsidy question. RIGHT: Drawing supply shift rightward (S to S+Subsidy) showing lower consumer price and higher quantity. MARK COST: Zero K marks for diagram. All diagram marks = zero. Cannot recover to Level 3 KAA without correct diagram.
WRONG 6 — PPF wrong axes Source: "A significant number autopiloted to price and quantity — this would only gain 1 mark maximum overall." — Oct 2024 WEC11 Examiner Report (verbatim)
WRONG: Y-axis = "Price", X-axis = "Quantity" on PPF question. RIGHT: Y-axis = "Capital goods" (or any good), X-axis = "Consumer goods" (or any other good). MARK COST: Maximum 1/4 marks regardless of diagram quality.
THE SAME ANSWER AT FOUR LEVELS — EXAMINER ANNOTATED
The question: "With reference to the extract, explain why demand for chicken is price inelastic." (4 marks, Q10 type)
LEVEL 1 (1/4) — What failing students write
[Genuine student register — wrong direction, no formula, confused terminology]
"Demand for chicken is inelastic because people need food. When the price goes up, more people want to buy it. The PED is positive. This shows the market is efficient."
Examiner annotates: Wrong direction (price up → Qd falls, not rises). "People need food" is assertion, not analysis. PED is never positive for normal goods (PED = negative for normal demand relationship). "Market is efficient" is irrelevant. → Level 1: isolated, imprecise knowledge. No chain. 1/4.
LEVEL 2 (2–3/4) — What C-grade students write
[Genuine student register — correct concept, correct direction, stops at Stage 3]
"Price elasticity of demand measures how much quantity demanded changes when price changes. [K ✓] When chicken prices rose from $1.50 to $3.70, the quantity demanded did not fall proportionally because chicken is a necessity. [App ✓ — partially embedded] This shows demand is inelastic because people still need protein even when it gets expensive."
Examiner annotates: K mark present (definition) ✓. Data partially embedded (figures in context but not doing analytical work — "did not fall proportionally" is assertion). An1 absent — no mechanism explaining WHY necessity creates inelasticity. An2 absent — no consequence stated. → Level 2: chains evident but stages omitted. 2–3/4.
ADDS to reach Level 3: The mechanism sentence (An1) and consequence (An2). 25 seconds.
LEVEL 3 ENTRY (3–4/4) — What B-grade students write
[Correct formula, embedded data, mechanism present, consequence stated]
"Price elasticity of demand measures the responsiveness of quantity demanded to a change in price — PED = %ΔQd / %ΔP, and a value between 0 and −1 confirms inelastic demand. [K ✓] With chicken prices rising 147% — from $1.50/kg in May 2020 to $3.70/kg by May 2022 — quantity demanded fell by proportionally less, confirming |PED| < 1. [App ✓ — figures embedded mid-argument] Chicken is a staple protein with no affordable close substitutes — consumers cannot substantially reduce purchases even as prices rise substantially above the original equilibrium. [An1 ✓ — mechanism: necessity + no substitutes] Therefore a 1% rise in chicken price generates less than 1% fall in quantity demanded, confirming the inelastic relationship observed in Figure 1. [An2 ✓]"
Examiner annotates: K mark ✓. App mark ✓ (147%, $1.50, $3.70 doing analytical work — removing them weakens argument). An1 ✓ (mechanism: necessity + no substitutes). An2 ✓ (consequence stated: PED < 1 confirmed). → Level 3. 4/4.
TRANSITION FROM LEVEL 2: Added An1 (necessity mechanism) + An2 (PED confirmation). Two sentences. 25 seconds.
LEVEL 3 TOP (4/4 with maximum depth) — What A*-grade students write
[Everything in Level 3 entry PLUS: diagram letter reference, determinant named, consequence extended]
"Price elasticity of demand measures the responsiveness of quantity demanded to a change in price — PED = %ΔQd / %ΔP, and |PED| < 1 confirms inelastic demand where percentage quantity change is smaller than percentage price change. [K ✓] With chicken prices rising 147% — from $1.50/kg to $3.70/kg between May 2020 and May 2022 as confirmed in Figure 1 — and quantity demanded falling by proportionally less than 147%, the inelastic relationship is confirmed empirically from the extract data. [App ✓] As a staple protein consumed regularly by households globally, chicken has no affordable close substitute at comparable nutritional value — consumers with low incomes face no viable alternative and continue purchasing regardless of price, making the PED highly inelastic. [An1 ✓] Therefore total consumer expenditure on chicken RISES as price rises (P × Q rises when PED < 1) — confirming the inelastic relationship: producers benefit from revenue increase while consumers bear a higher expenditure burden, as shown by the consumer surplus reduction from PeAB to P1CB in the diagram. [An2 ✓ — extended to revenue consequence]"
ADDS vs Level 3 entry: Extended An2 to include total expenditure consequence (P×Q rises when PED<1) and diagram letter reference. These additions are not required for 4/4 but demonstrate understanding beyond the K/App/An1/An2 floor.
EXAMINER THOUGHT PROCESS — THREE STAGES FOR EVERY RULE
For every major rule, the examiner's decision process follows three stages. Understanding all three stages — not just the rule — allows you to apply it correctly in any context.
RULE: Stage 4 earns the An2 mark
STAGE 1 — WHAT THE EXAMINER READS: "The examiner picks up a script and reads: 'Carbon emissions from chicken production harm third parties.' They note: Stage 3 endpoint. Chain stops before welfare consequence."
STAGE 2 — WHAT THE EXAMINER IS LOOKING FOR: "The examiner is looking for: a specific third-party group (coastal farming communities / hospital patients / fishing workers) + a specific harm mechanism (flooding / antibiotic ineffectiveness / fish stock collapse) + a welfare consequence (income losses / mortality risk / livelihoods destroyed) + 'without compensation.' Until all four are present, An2 is not awarded."
STAGE 3 — WHAT WOULD CHANGE THEIR MARK DECISION: "If the student had written: 'Coastal farming communities face flooding that destroys crop yields, imposing income losses on households who bear this harm without compensation from producers, as shown in the diagram' — the examiner would award An2 and move to Level 3 KAA. That sentence took 20 seconds to write."
RULE: Unconditional conclusion = Level 2 evaluation
STAGE 1 — WHAT THE EXAMINER READS: "The examiner reads: 'On balance, the indirect tax is the most effective policy for correcting the externality.' They note: unconditional. No named condition under which this conclusion fails."
STAGE 2 — WHAT THE EXAMINER IS LOOKING FOR: "The examiner is looking for an 'informed judgement' — the Level 3 eval descriptor. An informed judgement is, by definition, conditional. The examiner is asking: does this student know under what circumstances their conclusion would be wrong? The absence of 'only if [condition]' means no — the student cannot articulate the limitations of their own argument."
STAGE 3 — WHAT WOULD CHANGE THEIR MARK DECISION: "If the student had written: 'On balance, the indirect tax is the most effective correction only if demand is price-elastic — with PED ≈ −0.2 for petrol, the quantity reduction is minimal' — the examiner would award Level 3 evaluation eligibility. Three words: 'only if [condition].'"
RULE: App marks require embedded data not cited data
STAGE 1 — WHAT THE EXAMINER READS: "The examiner reads: 'Chicken prices rose 147% between 2020 and 2022. This shows supply fell.' They note: data stated as separate sentence. Not integrated into the mechanism."
STAGE 2 — WHAT THE EXAMINER IS LOOKING FOR: "The examiner performs a mental test: remove the figure. Does the argument still make the same generic point? In this case: 'Chicken prices rose. This shows supply fell.' — same generic argument. The figure was decorative, not analytical. App mark = zero."
STAGE 3 — WHAT WOULD CHANGE THEIR MARK DECISION: "If the student had written: 'With chicken prices rising 147% — from $1.50 to $3.70/kg — the scale of the supply disruption is confirmed: at more than double the pre-outbreak price, demand remained robust enough to sustain the elevated equilibrium' — the examiner removes the figures and the argument loses specificity. App mark awarded."
DIAGNOSE YOUR ANSWER
The specific missing element — not a category. "Needs more analysis" is useless. "Missing Stage 4: WHO + WHAT + WELFARE in one sentence" is the diagnosis.
Use this framework after every practice attempt. The diagnosis must be SPECIFIC — not a category.
After writing your answer, ask these four questions in order:
Q1: Did my Stage 4 name WHO specifically? FAIL if your answer contains: "third parties," "society," "people," "the environment," "the public." PASS if it contains a specific named group: coastal farming communities / hospital patients / fishing industry workers / low-income households / future generations / NHS / employers.
Q2: Did my Stage 4 name WHAT the specific harm mechanism is? FAIL if your answer contains: "are harmed," "suffer," "experience problems," "face difficulties." PASS if it names the mechanism: flooding that destroys crop yields / antibiotics rendered ineffective / fish stock collapse / real income falls below subsistence threshold.
Q3: Did my Stage 4 name the WELFARE CONSEQUENCE? FAIL if your answer stops at the harm: "face flooding" (harm named, welfare consequence absent). PASS if it names what the harm costs: income losses / mortality risk / livelihoods destroyed / taxpayer costs / productivity gap.
Q4: Did my conclusion contain "only if [named condition]"? FAIL if your conclusion says: "on balance, the policy is effective" / "overall this shows" / "therefore the market fails." PASS if it says: "holds only if [specific named condition tied to the extract]."
SCORING: 4/4 pass: Level 3 KAA + Level 3 eval accessible. Strong answer. 3/4 pass: Identify the single failing question. Write that one element only. Recheck. 2/4 pass: Stage 4 or conditional eval missing. Rewrite both before attempting a new question. ≤1/4 pass: Fundamental technique gap. Complete the Chain Engine drills before continuing.
DIAGNOSE YOUR USE OF THIS DOCUMENT
ATTEMPT 1 — Wrong use (common error): "I read this document and noted the key points." SPECIFIC FIX: Note-taking is not the goal. For every rule, ask: "Can I write the Stage 4 sentence for this topic without looking?" If NO → drill that specific topic before moving on. If YES → move to the next topic.
ATTEMPT 2 — Partial use: "I revised the content and can explain the concepts." SPECIFIC FIX: Understanding ≠ exam performance. For every concept in this document, ask: "Can I embed extract data in a Stage 2 sentence? Can I write Stage 4? Can I write 'only if [condition]' for this topic?" If any NO → that is the specific gap to drill.
ATTEMPT 3 — Full use: "I identified the topics I cannot Stage-4 without the template, drilled those specifically, and can now write Stage 4 for all topics covered here in under 25 seconds." → This is correct use. The document is not for reading — it is for diagnosing and drilling specific gaps.
ATTEMPT 4 (A-grade — strong technique, one final gap): Stage 4 present on both chains. Data embedded. Conditional judgement present ("holds only if demand is price-elastic"). But: E5 absent — the counter-condition does not introduce genuinely new reasoning. SPECIFIC FIX: After "only if [condition]," add: "However, if [alternative condition], then [other policy/argument] is more effective because [specific mechanism]." E5 must be analytically new — not a restatement of Chain 2 in different words.
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Not affiliated with or endorsed by Pearson Edexcel. Model answers are VERIDIAN exemplars verified against published mark schemes.
READ THIS FIRST
Section B is 20/80 marks. It is the highest marks-per-minute section on the paper — 4 marks in 5 minutes, with zero levels complexity. Every mark is a points-based decision.
Most students lose 4–6 marks in Section B through technique errors, not knowledge gaps. This bank provides perfect model answers for every Section B question type. Draw, Calculate, and Explain — so the technique is visible and can be replicated.
SECTION 1 — DRAW QUESTIONS (Q7 or Q8)
MODEL 1A — Supply Shifts Left (bird flu / supply disruption)
Question: Draw a supply and demand diagram to show the effect on the global market for chicken of the bird flu outbreak described in Extract A. (Jan 2024 type)
Perfect diagram (describe then draw):
Y-axis label: "Price of chicken ($/kg)"
X-axis label: "Quantity of chicken (millions of tonnes per year)"
Draw: Downward-sloping demand curve (D)
Draw: Upward-sloping supply curve (S)
Mark original equilibrium: Pe = $1.50, Qe
(dotted lines from Pe to Y-axis, from Qe to X-axis)
Draw: Supply shifts LEFT to S1 (parallel shift)
→ Bird flu removes supply, raising cost of production
→ S1 labelled clearly
Mark new equilibrium: P1 = $3.70, Q1
(dotted lines from P1 to Y-axis, from Q1 to X-axis)
→ P1 above Pe | Q1 left of Qe
Arrow showing direction of shift on supply curve.
4/4 annotation:
- K1: Correct diagram type — supply and demand ✓
- App1: Supply curve shifts LEFT (correct direction — supply disruption) ✓
- App2: Original equilibrium Pe/Qe labelled with dotted lines ✓
- App3: New equilibrium P1/Q1 labelled with dotted lines ✓
- Zero text beside diagram ✓ (Draw questions: diagram only)
The one rule: Zero written text. Every word written beside a Draw diagram earns zero and costs time.
MODEL 1B — Both Shifts on One Diagram (Q12c type)
Question: With reference to Extract A, draw a supply and demand diagram to show the impact on the price and quantity of cotton of a fall in supply and an increase in demand.
Perfect diagram:
Y-axis: "Price of cotton ($/lb)"
X-axis: "Quantity of cotton (millions of tonnes per year)"
Draw D (downward-sloping)
Draw S (upward-sloping)
Original equilibrium: Pe = $0.54, Qe
D shifts RIGHT to D1 (demand increases)
S shifts LEFT to S1 (supply falls)
BOTH ON SAME DIAGRAM
New equilibrium: P1 (above Pe), Q1 (direction depends on
relative shift magnitudes — label P1 above Pe)
P1 and Q1 labelled with dotted lines to both axes
4/4 annotation:
- K1: Both shifts on ONE diagram (not separate) ✓
- App1: D shifts right (demand increase — healthcare demand) ✓
- App2: S shifts left (Pakistan crop failure — supply fall) ✓
- App3: New equilibrium labelled ✓
Critical rule: Both shifts on one diagram. Separate diagrams = final equilibrium mark lost.
MODEL 1C — PPF Outward Shift
Question: Draw a production possibility frontier (PPF) diagram to show the effect of an improvement in technology on productive capacity.
Perfect diagram:
Y-axis: "Capital goods"
X-axis: "Consumer goods"
(NEVER "Price" and "Quantity")
Draw: Original PPF — concave to origin (bowed outward)
Label: PPF
Draw: New PPF — further from origin (outward shift)
Label: PPF₁
Arrow showing outward shift direction
ZERO text beside diagram
4/4 annotation:
- K1: Correct diagram type — PPF (not AD/AS, not S/D) ✓
- App1: Axes = two goods (not price/quantity) ✓ — this is the most common error
- App2: Original PPF labelled ✓
- App3: New PPF₁ further from origin (outward shift) with arrow ✓
The axis rule: Capital goods and Consumer goods. Or Good A and Good B. Or Agricultural goods and Manufactured goods. NEVER "Price" and "Quantity" — confirmed maximum 1/4 if wrong axes.
MODEL 1D — Maximum Price
Question: Draw a supply and demand diagram to show the effect of a maximum price set below the equilibrium price.
Perfect diagram:
Y-axis: "Price of [good] (£)"
X-axis: "Quantity of [good] (units)"
Draw: D (downward-sloping) and S (upward-sloping)
Mark: Pe (equilibrium) and Qe
Draw: Horizontal line at Pmax — BELOW Pe
Label: "Pmax (maximum price)"
At Pmax: Qs (left — supply contracts) and Qd (right — demand extends)
Label: Qs and Qd
Draw: Shortage arrow between Qs and Qd
Label: "Shortage = Qd − Qs"
4/4 annotation:
- K1: Pmax line correctly BELOW Pe ✓
- App1: Qs < Qe (supply contracts at lower price) ✓
- App2: Qd > Qe (demand extends at lower price) ✓
- App3: Shortage clearly labelled between Qs and Qd ✓
SECTION 2 — CALCULATE QUESTIONS (Q9)
MODEL 2A — PED Calculation
Question: Using Figure 1, calculate the price elasticity of demand. Price falls from $3.70/kg to $2.80/kg. Quantity demanded rises from 5m to 6.2m tonnes.
Perfect answer:
PED = %ΔQd / %ΔP [K ✓ — formula first]
%ΔQd = (6.2 − 5.0) / 5.0 × 100 = +24%
%ΔP = (2.80 − 3.70) / 3.70 × 100 = −24.3%
PED = +24% / −24.3% = −0.99 [App ✓ — working shown]
PED = −0.99, which is between 0 and −1:
demand is price-inelastic. [An1 ✓ — inelastic identified]
A 1% fall in the price of chicken leads to a 0.99%
rise in quantity demanded — consumers are relatively
unresponsive to price changes, confirming chicken
is a price-inelastic good. [An2 ✓ — interpretation]
4/4 checklist: ☐ Formula written first (K mark) ☐ Working shown step-by-step (App mark) ☐ No % sign after PED value (−0.99 not −0.99%) ☐ Correct sign (negative — price and quantity move in opposite directions) ☐ Interpretation sentence: elastic/inelastic + reason (An marks)
MODEL 2B — YED Calculation
Question: Income rises by 8%. Quantity demanded for new cars rises by 24%. Calculate the income elasticity of demand. State what type of good this is.
Perfect answer:
YED = %ΔQd / %ΔIncome [K ✓ — formula, Qd on top]
YED = 24% / 8% = +3 [App ✓ — working shown]
YED = +3 > 0: new cars are a normal good —
quantity demanded rises as income rises. [An1 ✓]
YED = +3 > 1: new cars are a luxury good —
quantity demanded rises proportionally more
than income, confirming luxury status. [An2 ✓]
The formula trap: YED = %ΔQd / %ΔIncome. Qd is ALWAYS on top. Income is ALWAYS on the bottom. Inverting gives 8/24 = 0.33 — wrong. Confirmed error every series.
MODEL 2C — PES Calculation
Question: Using Figure 2, a 50% rise in cocoa price led to a 3.5% increase in quantity supplied in the short run and a 28.5% increase in the long run. Calculate short-run and long-run PES.
Perfect answer:
PES = %ΔQs / %ΔP [K ✓]
Short-run PES = 3.5% / 50% = +0.07 [App ✓]
Long-run PES = 28.5% / 50% = +0.57 [App ✓]
Both values are between 0 and 1: supply is
price-inelastic in both time periods. [An1 ✓]
Short-run PES (+0.07) is closer to zero than
long-run PES (+0.57), because cocoa trees take
3–4 years to mature — supply cannot respond
to price signals within a short period, but
over the long run new trees come into production,
increasing PES toward unit elasticity. [An2 ✓]
MODEL 2D — XED Calculation
Question: The price of tea rises by 10%. Demand for coffee rises by 15%. Calculate the cross elasticity of demand and state the relationship between tea and coffee.
Perfect answer:
XED = %ΔQd(Coffee) / %ΔP(Tea) [K ✓]
XED = +15% / +10% = +1.5 [App ✓ — working shown]
XED = +1.5 > 0: tea and coffee are substitute
goods — a rise in the price of tea leads
to a rise in demand for coffee. [An1 ✓]
The high positive value (+1.5) indicates the
goods are close substitutes — consumers
readily switch between them in response
to price changes. [An2 ✓]
SECTION 3 — EXPLAIN QUESTIONS (Q8, Q10, Q11)
MODEL 3A — Explain PED Factor
Question: With reference to Figure 2, explain why demand for energy is price inelastic in Australia.
Perfect answer (4 sentences, 4 marks):
"Price elasticity of demand measures the responsiveness of quantity demanded to a change in price. PED = %ΔQd / %ΔP, and a value between 0 and −1 confirms inelastic demand. [K ✓] Figure 2 confirms Australia's energy PED = −0.04, meaning a 1% rise in energy price generates only a 0.04% fall in quantity demanded — highly inelastic compared to the national averages of Canada (−0.05), France (−0.03), and USA (−0.06). [App ✓ — −0.04 embedded in mechanism] Energy is a necessity with no close substitutes — consumers require electricity and heating regardless of price changes, and switching to alternative energy sources is costly and time-consuming in the short run. [An1 ✓ — necessity + no substitutes] Therefore even a large price rise generates only a minimal fall in quantity demanded, confirming the inelastic relationship and explaining why energy companies can raise prices with minimal demand response. [An2 ✓]"
MODEL 3B — Explain External Cost
Question: With reference to Extract A, explain one external cost arising from the production of chicken.
Perfect answer (4 sentences):
"An external cost is a cost imposed on third parties not party to a transaction, causing MSC to exceed MPC. the cost is not reflected in the market price. [K ✓] Chicken production generates 0.7kg of CO₂ per kilogram produced, contributing to greenhouse gas emissions that represent 15% of global totals from meat production — an external cost not internalised in the price of chicken. [App ✓ — 0.7kg and 15% embedded] As atmospheric carbon accumulates from chicken farming and other meat production, coastal farming communities face flooding from rising sea levels that destroys crop yields, imposing income losses on households who bear this harm without compensation from producers. [An1 ✓ — Stage 4: specific third party, specific harm, welfare consequence] The divergence between MSC (including atmospheric carbon costs) and MPC (production costs alone) means the free market overproduces chicken at Qme beyond the social optimum Qso — the welfare loss triangle confirms the deadweight loss from overproduction. [An2 ✓]"
MODEL 3C — Explain Price Mechanism Function
Question: With reference to Extract A, explain how the price mechanism performs a signalling function in the global chicken market.
Perfect answer (4 sentences):
"The signalling function of the price mechanism occurs when price changes transmit information about scarcity to buyers and sellers without central coordination. [K ✓] When chicken prices rose from $1.50/kg in May 2020 to $3.70/kg by May 2022. driven by bird flu removing 140 million chickens from global supply — this 147% price increase transmitted a signal throughout the global chicken market. [App ✓ — $1.50, $3.70, 147%, 140m embedded] Producers interpreted the price rise as a signal that chicken had become relatively scarce, responding by increasing breeding capacity and feed investment — without needing to know whether scarcity arose from bird flu, rising demand, or another cause. [An1 ✓ — mechanism: price signal transmits fact of scarcity, not reason] The price signal alone — not government direction or industry communication — coordinated supply expansion across thousands of independent producers globally, demonstrating the price mechanism's capacity for decentralised coordination of economic activity. [An2 ✓]"
MODEL 3D — Explain Government Failure
Question: Explain one cause of government failure.
Perfect answer (4 sentences):
"Government failure occurs when government intervention leads to a net welfare loss. the allocation of resources after intervention is worse than without it. [K ✓] An import tax of approximately 80% on cars — designed to protect domestic manufacturers — created a price differential making cross-border smuggling from adjacent lower-tax markets economically rational. [App ✓ — 80% embedded in mechanism] As smuggling networks developed, the government achieved neither its fiscal objective (tax revenue lower than projected due to leakage) nor its industrial policy objective (domestic manufacturers still undercut by cheaper smuggled vehicles), while generating criminal justice costs on public finances. [An1 ✓ — mechanism: three simultaneous welfare losses named] The net welfare outcome was worse than both the original market failure and a lower, enforceable tariff — confirming government failure in the strict Pearson definition: intervention resulted in a net welfare loss rather than a welfare improvement. [An2 ✓]"
MODEL 3E — Explain Consumer Surplus Change
Question: With reference to the diagram, explain the effect of an indirect tax on consumer surplus.
Perfect answer (4 sentences):
"Consumer surplus is the difference between the maximum price consumers are willing to pay and the price they actually pay. the area above the market price and below the demand curve. [K ✓] An indirect tax shifts supply leftward from S to S+Tax, raising the price from Pe to P1 as shown in the diagram — the price rise of £[figure] represents the consumer incidence of the tax. [App ✓ — diagram referenced, price data embedded] As price rises from Pe to P1, the area above P1 and below the demand curve is smaller than the original area above Pe — consumer surplus falls from triangle PeEF to triangle P1EW in the diagram. [An1 ✓ — area labels from diagram] Consumers who were willing to pay between Pe and P1 are now priced out of the market, bearing a welfare loss equal to the trapezoid P1PeEW — representing welfare transferred to government revenue (the rectangle) and the deadweight loss triangle. [An2 ✓]"
SECTION 4 — THE SECTION B PROTOCOL
╔════════════════════════════════════════════════════╗
║ SECTION B — 5 QUESTIONS × 4 MARKS × 5 MINUTES ║
╠════════════════════════════════════════════════════╣
║ DRAW questions: ║
║ → Identify diagram type (30 sec) ║
║ → Label axes FIRST (correct labels, 30 sec) ║
║ → Draw original equilibrium (60 sec) ║
║ → Apply shift(s) and label (90 sec) ║
║ → Mark new equilibrium with dotted lines (60 sec) ║
║ → Check: zero text written? (5 sec) ║
║ ║
║ CALCULATE questions: ║
║ → Write formula FIRST (10 sec) ║
║ → Show all working step by step (90 sec) ║
║ → Write answer: no % sign, correct sign (30 sec) ║
║ → Write interpretation sentence (60 sec) ║
║ ║
║ EXPLAIN questions: ║
║ → Definition first sentence (30 sec) ║
║ → Extract figure embedded in sentence 2 (60 sec) ║
║ → Mechanism — signal word required (60 sec) ║
║ → Consequence — Stage 4 if possible (90 sec) ║
║ → STOP at 4 sentences. Never over-write. ║
╠════════════════════════════════════════════════════╣
║ TARGET: 18–20/20 across all 5 questions ║
║ MINIMUM: 4/4 on at least 4 questions ║
╚════════════════════════════════════════════════════╝
→ Also read: FORGE · 4-Mark System (theory) | FORGE · Diagram Masterclass (all 8 diagram types) | CODEX · Application Bank (confirmed figures) | SIGNAL · A* Gap Analysis (Section B errors)
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VERIDIAN WEC11 · CODEX SERIES · SECTION B MODEL ANSWER BANK | v1.0
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