What inflation is, and how it hits you

The definition that actually helps

Inflation means prices, on average, are rising. The useful way to read that is from the other side: your money is losing purchasing power. Those are the same sentence, but the second one is the one that changes decisions.

“On average” is doing real work in that sentence. Inflation is measured with a basket meant to represent typical household spending — food, housing, transport, services. Your personal inflation can be much higher or lower depending on what you actually buy. If most of your money goes to rent in a city where rent is climbing fast, the official number will feel like an understatement, and you’re not imagining it.

Where it comes from

• Demand runs ahead of supply. More people wanting to buy than there are things to sell. Prices are how that queue resolves.
• Costs go up. Energy, raw materials, wages, shipping. When producing something gets more expensive, part of that reaches the shelf.
• The currency weakens. For a country that imports a lot, a weaker peso means imported goods cost more in local money, and that feeds through with a delay of months.
• Expectations. The strangest one and not the least important. If everyone believes prices will rise 6%, businesses raise prices and workers ask for raises to match — which makes it happen. Central banks care enormously about this loop.

How it hits your salary

If your pay rises 4% and inflation is 5%, you got a raise on paper and a pay cut in practice. Your nominal salary went up, your real salary went down. This is the single most useful pair of words in this lesson: nominal is the number, real is what it buys.

The same logic applies to savings. A savings account paying 3% while prices rise 5% is not keeping your money safe — it’s losing about 2% a year, slowly and invisibly. Money sitting still is not neutral. Standing still while the ground moves is going backwards.

Put a number on it with something you actually buy. Tacos and a soda at a hundred pesos is the default; move the price to your bus fare, your phone plan or a term of tuition and watch what the same money still buys.

Why central banks raise rates

When inflation runs hot, Banxico and the Fed raise their reference rate. The chain is deliberately blunt: higher rates make credit more expensive, expensive credit means people and companies borrow and spend less, less spending cools demand, and cooler demand slows price increases.

It works, and it hurts on the way. The same medicine that slows inflation also slows hiring and makes mortgages and card debt more expensive. That’s why rate decisions are argued about so much — there’s no version where somebody isn’t worse off. It also explains why they don’t wait for inflation to arrive: rate changes take many months to show up in prices, so central banks are always acting on a forecast.

What you can actually do

1. Don’t leave large amounts in an account paying near zero. Emergency money should be liquid, but liquid doesn’t have to mean unpaid. Instruments like Cetes or a money-market fund exist for exactly this.
2. Think in real terms. When you evaluate a raise, a return, or a savings rate, subtract inflation first. It changes a surprising number of conclusions.
3. Own things that grow with the economy. Over long stretches, productive assets have tended to outrun inflation while cash reliably hasn’t. That’s the argument for investing long-term money, not enthusiasm about markets.
4. Fixed-rate debt gets easier. If you owe a fixed amount, inflation quietly shrinks the real weight of that payment over the years. It’s one of the few places it works in your favor.

The short version

Inflation is your money losing purchasing power. It comes from demand, costs, the currency, and expectations. It turns raises into pay cuts and safe savings into slow losses, and it’s why central banks raise rates even when raising them is unpopular. You can’t stop it — but once you start reading every number in real terms, you stop being surprised by it.