Inflation and the Price Level
Inflation &
the Price Level.
Inflation is a sustained increase in the general price level—not simply one expensive product. Construct a consumer-price index, measure purchasing-power change, and distinguish the forces that generate inflation.
Observe
Separate a price from the price level.
One price increase is not necessarily
economy-wide inflation.
A poor harvest may raise tomato prices while other prices remain stable. Inflation describes a continuing rise in a broad index of prices. The price level is the index itself; inflation is its percentage rate of change.
Falling inflation means prices are rising more slowly. Deflation means the general price level is actually falling.
Think
Build an index.
A consumer basket translates many prices
into one measure.
The CPI values a representative fixed basket at current prices and compares its cost with the base period. Fixed weights make the index transparent but create substitution, quality-change and new-product challenges.
CPI
Current basket cost divided by base basket cost, multiplied by 100.
%ΔCPI
Percentage change in the index between two periods.
Real value
Nominal income adjusted for the price level.
Analyse
Change the basket prices.
Construct a live
consumer-price index.
The base basket costs €100: food €40, housing €35 and transport €25. Adjust each current-period component and observe the CPI, inflation and purchasing power of €1,000.
CPI laboratory
INTERACTIVE PRICE BASKET
Price indicators
The basket costs 10% more than in the base period, reducing the purchasing power of a fixed nominal income.
Apply
Trace causes and consequences.
Inflation redistributes
when it is unexpected.
Demand-pull inflation arises when aggregate demand grows faster than productive capacity. Cost-push inflation follows adverse supply shocks. Persistent inflation can also become embedded through expectations and wage–price setting.
Excess aggregate demand
Strong spending pushes output toward capacity and raises price pressure.
Adverse supply conditions
Energy, wages or imported inputs raise unit production costs.
Redistribution
Fixed nominal claims lose real value, often benefiting borrowers over lenders.
Partial protection
Wages, pensions or contracts adjust with an index, though usually with delays.
Decide
Interpret disinflation correctly.
Prices rise more slowly—
what has happened?
Inflation falls from 8% to 3%, while the CPI continues to increase.
MACROECONOMICS · MODULE 07 COMPLETE
You can now measure
the changing value of money.
The CPI tracks a representative basket, inflation measures its rate of change, and real variables reveal purchasing power. Causes, expectations and distribution matter for policy.
