What Is Inflation? Causes, Effects & How to Calculate It
Blog › Finance · 10 min read · Published 2026-03-12
Learn what inflation is, how CPI measures it, what causes prices to rise, and how inflation impacts your savings, investments, and purchasing power.
What Is Inflation?
Inflation is the rate at which the general level of prices for goods and services rises over time, eroding the purchasing power of money. When inflation is 3%, something that cost $100 last year now costs $103. Central banks like the US Federal Reserve target approximately 2% annual inflation as "healthy."
How Is Inflation Measured?
The most common measure is the Consumer Price Index (CPI), calculated by the Bureau of Labor Statistics (BLS). The CPI tracks the cost of approximately 80,000 items including food, housing, transportation, and medical care.
Inflation Rate Formula: Inflation Rate = ((CPI_current - CPI_previous) / CPI_previous) x 100
Other measures include the Personal Consumption Expenditures (PCE) index, Producer Price Index (PPI), and GDP Deflator. Core inflation excludes volatile food and energy prices.
What Causes Inflation?
Demand-Pull Inflation
Occurs when demand for goods and services exceeds supply. When consumers have more money but production cannot keep up, prices rise. The COVID-19 recovery period demonstrated this with stimulus payments meeting constrained supply chains.
Cost-Push Inflation
Happens when production costs increase — raw materials, labor, energy — forcing businesses to raise prices. The 2022 energy crisis is a textbook example of cost-push inflation cascading across industries.
Built-In (Wage-Price Spiral)
Workers demand higher wages to keep up with rising prices. Businesses raise prices to cover higher labor costs, creating a self-reinforcing cycle.
How Inflation Affects Your Money
Savings: Money earning 1% interest with 3% inflation loses 2% purchasing power annually. $10,000 today buys only $7,374 worth of goods in 10 years at 3% inflation.
Investments: Stocks historically outpace inflation with 7% real return. Real estate and commodities serve as inflation hedges.
Debt: Fixed-rate debt becomes cheaper in real terms during inflation — your mortgage payment stays the same while income rises.
Inflation Protection Strategies
- TIPS: Treasury Inflation-Protected Securities with principal that adjusts with CPI
- I Bonds: Savings bonds with rates adjusting semi-annually based on CPI
- Equities: Companies can raise prices, so stocks tend to keep pace long-term
- Real estate: Property values and rents generally rise with inflation
Historical Inflation Events
- US 2022: CPI reached 9.1%, the highest in 40 years, driven by energy costs and supply disruptions
- Weimar Germany 1923: Hyperinflation reached 29,500% monthly
- Zimbabwe 2008: Monthly inflation reached 79.6 billion percent
- Japan 1990s-2010s: Persistent deflation despite massive monetary stimulus
FAQ
What is a good inflation rate?
Most central banks target 2% annual inflation — low enough for price stability, high enough to prevent deflation and allow monetary policy flexibility.
Is inflation always bad?
No. Moderate inflation (1-3%) is healthy. It encourages spending, allows central banks room to cut rates during recessions, and reduces the real burden of debt.
How do I calculate my personal inflation rate?
Track your actual spending on housing, food, transportation, and healthcare over time. Your personal rate may differ significantly from CPI based on your spending patterns.