The price level is how high prices are overall, shown by an index. The inflation rate is how fast that level is changing, shown as a percentage. A level can keep rising while its rate falls, and this lesson is about writing that clearly.
It follows from interpreting an index change and underpins the household lesson later in inflation and unemployment.
Think of a car journey
Distance is the level; speed is the rate. If a car slows from 80 km/h to 60 km/h, it is still moving forward, only more slowly. Inflation is the speed, and the price level is the distance travelled.
So “inflation fell from 5% to 3%” tells you the car slowed, not that it reversed. Reversing would be deflation: a negative inflation rate and a falling price level.
Three situations to name correctly
| Situation | Price level | Inflation rate | Term |
|---|---|---|---|
| Index 120, then 126, then 132.3 | rising | 5% then 5% | steady inflation |
| Index 126, then 129.78 | rising | falls from 5% to 3% | disinflation |
| Index 129.78, then 128.48 | falling | about −1% | deflation |
Worked example
Lestari’s price index over four years is: 2023 = 120, 2024 = 126, 2025 = 129.78, 2026 = 128.48.
Step 1, 2024 rate: (126 − 120) ÷ 120 = 5%.
Step 2, 2025 rate: (129.78 − 126) ÷ 126 = 3%.
Step 3, 2026 rate: (128.48 − 129.78) ÷ 129.78 = −1.30 ÷ 129.78 ≈ −1.0%.
Step 4, describe each period. In 2025 inflation fell from 5% to 3%: the level still rose, so this is disinflation. In 2026 the level itself fell, so the rate is negative: deflation.
Step 5, write one clear sentence. “Between 2024 and 2025 the price level rose by 3%, a slower rate than the previous year’s 5%, so inflation fell but prices were still higher.”
The mistake to watch for
Mistaken answer: “Inflation fell from 5% to 3%, so goods became cheaper in 2025.”
The student read a lower rate as a lower level. The index went from 126 to 129.78, so the same basket cost more.
The correction is to write both measures: “The rate fell, but the index still rose, so the basket cost 3% more.”
Check yourself
1. An index rises from 200 to 210. Find the inflation rate for the year.
Show answer
10 ÷ 200 = 0.05, so 5%.
2. Inflation falls from 8% to 4%. Are prices lower after the fall? Explain.
Show answer
No. A 4% rate is still positive, so the price level still rises, only more slowly than at 8%. This is disinflation, not deflation.
3. The index in 2025 is 150 and inflation in 2026 is 2%. What is the 2026 index?
Show answer
150 × 1.02 = 153.
Where this leads next
Now look at different unemployment mechanisms, which use similar careful wording. The percentage-base explorer lets you chain several yearly changes, and the mixed practice set tests both lessons.
When a student understands the idea but keeps writing “prices fell”, a teacher in online one-to-one Economics tuition can listen to the sentence and correct the term at once.