IB Economics: Inflation & Deflation FAQ

Start by defining the term precisely, then explain the causal chain using an AD/AS diagram. Always link theory to a real, dated example — Zimbabwe, Japan, the 2022 energy shock — and evaluate who's affected and to what extent. Examiners reward reasoning chains, not bare definitions.

Draw a standard AD/AS diagram with price level on the y-axis and real output on the x-axis. For demand-pull inflation shift AD rightward; for cost-push inflation shift SRAS leftward. Label the original and new equilibrium points clearly — an unlabelled diagram loses marks even if the shift is correct.

Inflation stems from either demand-pull pressures — AD outstripping AS, often from low interest rates or rising wages — or cost-push pressures, where rising production costs shift SRAS left. The syllabus also expects a monetarist explanation: inflation driven by excessive growth in the money supply relative to output.

Deflation happens when AD falls faster than AS, dragging the general price level down — usually from a banking crisis, a housing crash, or collapsing confidence. It can also be 'good deflation', where productivity gains cut costs and prices together without hurting output or employment.

Demand-pull inflation is pulled by too much spending relative to output — AD shifts right along a fixed SRAS. Cost-push inflation is pushed by rising input costs (oil, wages, imports) — SRAS shifts left while AD stays constant. Same rising price level, opposite diagrams and opposite policy responses.

No — not always. Deflation caused by falling AD ('bad deflation') brings recession and rising unemployment, but deflation from improved productivity ('good deflation') lets firms cut prices while output and profits keep growing. Examiners want this distinction stated explicitly, not assumed.

The syllabus uses the Consumer Price Index: a basket of goods and services weighted by typical household spending, tracked against a base year. According to the current IB Economics guide, you're expected to know CPI's construction and its limitations — substitution bias, quality changes, and unrepresentative baskets across households.

Costs include reduced purchasing power, menu costs, shoe-leather costs, and uncertainty that discourages business investment. If domestic inflation runs higher than trading partners', exports lose competitiveness too. Hyperinflation, in the extreme, destroys trust in a currency entirely and can trigger dollarisation.

Deflation's costs include falling profits, wage cuts or rising unemployment, and a real debt burden that grows even though nominal debt stays fixed. Worse, consumers delay purchases expecting further price falls — a spiral that deepens the very recession causing the deflation in the first place.

SL and HL students cover identical causes, costs, and CPI mechanics for inflation and deflation — the core content doesn't change. HL students go further with the Phillips Curve trade-off and monetarist quantity theory, and may face quantitative CPI or inflation-rate calculations in HL Paper 3.

In Paper 1, inflation or deflation can form a full 25-mark essay requiring evaluation, not just a diagram. In Paper 2, it's more often a 4-8 mark data-response sub-question testing definitions and diagram accuracy. HL Paper 3 may ask you to calculate or interpret real CPI data.

Use Zimbabwe's hyperinflation (2007-08) for demand-pull and money-supply causes, the 2021-23 global cost-push inflation from energy and supply-chain shocks, and Japan's prolonged deflation since the 1990s as a mature 'bad deflation' case study. Named, dated examples score higher than vague generalisations every time.

Students get the most value from topical worksheets isolating AD/AS diagram practice, revision notes summarising CPI construction and cost lists, and timed mock papers. On revisionprep.com these are mapped directly to the current DP Economics guide, so your child revises exactly what's examinable — not generic content.