What is Inflation?
Inflation is a gradual increase in the average price level of goods and services in an economy. When inflation occurs, each unit of currency buys less than before — your money's purchasing power shrinks.
Inflation is the rate at which the average price level rises over time. It reduces purchasing power and occurs when there is too much money chasing too few goods (demand-pull) or rising production costs (cost-push).
Step-by-step worked examples
A gallon of milk costs $3 in Year 1. If inflation is 4% annually, what does it cost in Year 2?
New price = Old price × (1 + inflation rate) Year 2 price = 3 × (1 + 0.04) = 3 × 1.04 = $3.12 The milk is $0.12 more expensive.
Your salary is $50,000 per year. Inflation is 3%. How much purchasing power did you lose?
Purchasing power loss = Salary × inflation rate Loss = 50,000 × 0.03 = $1,500 You can buy $1,500 less in goods than last year.
A basket of goods cost $100 last year and $103 this year. What is the inflation rate?
Inflation rate = (New price − Old price) / Old price Inflation = (103 − 100) / 100 = 3 / 100 = 0.03 = 3%
Flashcards
Quick quiz
Q1.If inflation is 5% and a book costs $20, what will it cost next year?
Q2.Inflation is primarily caused by…
Q3.A $1,000 savings account earns 1% interest. Inflation is 3%. Your real return is…
Q4.Moderate inflation is considered healthy because…
The full card deck, worked steps and AI-tutor support for “What is Inflation?” are in Notek — study by hand before your exam.
Common mistakes
Confusing inflation rate with absolute price. — Correct: Inflation is the rate of change, not the price itself.
Thinking all inflation is bad. — Correct: Moderate inflation (2–3%) is healthy; high inflation is harmful.
Ignoring inflation when comparing money over time. — Correct: Always adjust for inflation to compare real values.
Assuming nominal returns equal real returns. — Correct: Real return = nominal return − inflation rate.
FAQ
What is inflation and why does it happen?
Inflation is the rise in average prices over time. It happens when there's too much money, costs rise, or demand exceeds supply.
How is inflation measured?
By the Consumer Price Index (CPI), which tracks the cost of a basket of typical household goods and services.
Is inflation always negative?
No — moderate inflation (2–3%) is healthy for an economy. High inflation (>5%) erodes savings; deflation is worse.
How does inflation affect me?
Your purchasing power shrinks — you buy less with the same money. Savers lose, borrowers benefit (debt is cheaper).