You’ve probably heard people talk about how things were cheaper “back in the day.” A movie ticket, a candy bar, a new car—all cost less 20 years ago than they do today. This steady rise in the price of goods and services over time is called inflation.

At its core, inflation means your money buys less than it used to. The value of a single dollar decreases, eroding your purchasing power. If inflation is at 3%, that cup of coffee that costs $3.00 today might cost $3.09 next year. It's a small change, but over many years and across all the things you buy, it adds up significantly.

Inflation doesn’t just happen. It's caused by a mix of economic pressures. The two main culprits are strong consumer demand and rising production costs.

Demand-pull inflation occurs when demand for goods and services outstrips the economy's ability to produce them. It’s a classic case of “too much money chasing too few goods.” When everyone wants to buy the latest smartphone but there aren't enough to go around, sellers can raise prices. This can happen when an economy is strong, unemployment is low, and consumers feel confident about spending.

Cost-push inflation is the flip side. It happens when the cost to produce goods and services goes up. If a natural disaster disrupts supply chains or the price of oil skyrockets, it becomes more expensive for companies to make and ship their products. To protect their profits, they pass those higher costs on to consumers in the form of higher prices.

Inflation affects everyone, from savers and investors to businesses and governments. For individuals, the most direct impact is the loss of purchasing power. If your income doesn't increase at the same rate as inflation, you can't afford the same lifestyle. This is especially hard on people with fixed incomes, like retirees.

It also discourages saving. Why keep cash in a savings account earning 1% interest when inflation is running at 3%? Your money is effectively losing value. This encourages people to spend or invest their money to get a better return, which can further stimulate the economy.

For businesses, high inflation creates uncertainty. It's difficult to set prices and plan for future costs when you don't know what your supplies or labor will cost next year. However, a small, predictable amount of inflation (often around 2%) is generally considered healthy for an economy, as it signals growth and encourages spending.

To track inflation, government agencies like the Bureau of Labor Statistics (BLS) use a method that's like a massive shopping trip. They create a hypothetical "basket" of goods and services that represents what an average urban household buys in a month. This includes everything from groceries and gasoline to rent and doctor's visits.

Analysts track the total cost of this basket every month. The percentage change in the price of the basket over a period, usually a year, is the inflation rate. This rate, known as the Consumer Price Index or CPI, is the number you most often hear about in the news.

Understanding inflation is the first step toward navigating its effects on your own financial life. It’s a fundamental force in the economy that shapes the value of your money and influences major financial decisions.