Technique Masterclasses

Business Paper 1 — Marketing and People

Topic Brief: Demand Supply and Elasticity

SIGNAL Topic Master Brief — Demand, Supply and Elasticity (WBS11, spec 1.3.2)

Provenance (2026-09-29). Built from research/veridian/WBS11-verified-facts.md (§0's provenance note; §3's full "1.3.2 The market" section, including its 2026-09-13 mark-scheme-bullet re-verification pass; §4's cross-cutting-pattern list; §5's topic-priority list) and cross-checked against content/veridian/curriculum/wbs11/demand-supply-and-elasticity.ts (the lesson's own flag block) so nothing here duplicates its worked exemplars. Also read in full: codex-deep-dive-demand-supply-and-elasticity.md (its Part 6 series-by-series ledger) and signal-frequency-and-boundaries.md (its single 1.3.2 row) — both already state the headline fact that this spec point was hit in all 7 of the 7 series checked for it. This brief does not restate that ledger. It cuts the same underlying evidence a different way: by spec sub-point letter, to show that "most-tested topic on the paper" and "every part of this topic is well-anchored" are not the same claim — several named sub-points have zero confirmed real anchor even though the spec point as a whole does not. content/veridian/question-bank/wbs11.ts has no 1.3.2 item, confirming there is no overlap to avoid on that front either. Two further real sightings (January 2025, October 2024), independently verified by forge-exam-technique-guide.md but not yet folded into the facts bank's own 7-series denominator, are marked † below, per that document's own disclosure convention. Not affiliated with or endorsed by Pearson Edexcel.

Frequency, by spec sub-point — seen in N of 7 series checked

Mark-tariff pattern

Every confirmed real sighting sits at Define (2), Calculate/Construct (4) or Analyse (6) — never Discuss, Assess or Evaluate; the lesson's own flag block confirms a dedicated search for an 8/10/20-mark anchor came back empty. A second pattern, visible only once the anchors above are read as a set rather than one at a time: every single confirmed sighting sits at Q1 or Q2 of its paper — never later. That fits the no-essay finding rather than sitting alongside it by coincidence: this paper's Q3 slot is where the 20-mark Evaluate essay usually lives, and this topic has never anchored one.

Recurring context/angle

Two things repeat. First, the diagram question always tests the same underlying skill (one curve shifts, both equilibria are labelled) behind a genuinely different surface cause each time — advertising, a substitute's price, an unstated supply-side factor — so treating "the diagram question" as one memorisable scenario rather than one transferable skill is the recurring trap, not the content itself. Second, this topic's application value shows up beyond its own spec point: the PED-significance idea (1.3.2.4d) is real and marked, but the only place it has actually been credited is inside a branding question (Jan 2024 Q1c), not an elasticity one — a reminder that revising 1.3.2 in isolation from 1.3.3's branding/pricing content misses where part of it is actually examined.

If this topic appears, here's what to expect

A short-tariff (2–6 mark) Define, Calculate, Construct or Analyse question, in Q1 or Q2, never an essay. If it's the diagram: expect a named cause you haven't seen before, tested via the same single-shift, both-equilibria-labelled skill. If it's a calculation: check whether the question gives raw data (find the elasticity) or an elasticity plus one %Δ (find the other %Δ by multiplying) — the second direction has already repeated once, two years apart. The genuinely thin ground, on the evidence checked, is the theory of why PED and YED matter to a business — 1.3.2.4d and 1.3.2.5d/e have no dedicated anchor at all — which this paper's own pattern (a first-examined sub-point is disproportionately badly answered, confirmed for 1.3.2.4e in Jan 2023) makes worth extra attention precisely because it hasn't been tested yet, not less.