In short
- Inflation is the general rise in prices over time. Each rupee buys a little less.
- In India, the main measure for households is the Consumer Price Index (CPI), published every month.
- Money left idle loses buying power. What matters is your return after inflation, tax and costs.
What inflation is
Think of a basket of things a household buys in a month: rice, vegetables, milk, rent, bus fares, school fees, a phone recharge. If the same basket costs more this year than last, prices have risen. Inflation is that rise, measured across the whole basket rather than for one item.
Some prices rise faster than others. Vegetables can jump after a poor monsoon and fall again. Rent and school fees tend to climb steadily. Inflation is the average experience, so yours may be higher or lower depending on what you spend on.
How India measures it
The government's statistics office collects prices from markets across the country every month and publishes the Consumer Price Index (CPI). The headline number in the news is usually the yearly change: how much the basket costs now compared with the same month a year earlier.
Food carries a large weight in India's CPI, so food prices move the headline number a lot. The RBI uses CPI inflation as its main guide when it sets interest rates (see what the repo rate is). There is also a wholesale price index (WPI), which tracks prices businesses pay. It is useful, but CPI is closer to what households feel.
Why cash quietly loses value
A made-up example: say a basket costs ₹1,000 [hypothetical] today and prices rise 6% a year [hypothetical]. Next year the same basket costs ₹1,060 [hypothetical]. If your ₹1,000 sat in a drawer, it now buys a little less than a full basket. Nothing on paper changed. The loss is in what the money can do.
Over many years this adds up. That is why “safe” and “keeping its value” are not quite the same thing.
Try it: what ₹1,000 buys over time
Today ₹1,000 [hypothetical] buys all ten things in the basket. Move the slider to see what the same ₹1,000 buys as prices rise.
Today the basket costs ₹1,000 [hypothetical], and your ₹1,000 buys all 10 things.
The rates are made up for teaching. Real inflation changes from year to year, and your own basket may rise faster or slower.
Real return: the number that matters
If a savings account pays interest, the useful question is whether it beats inflation. The return you see is the nominal return. Take inflation away and you get the real return: roughly, how much more you can actually buy. Then tax and costs come out too (see how gains are taxed).
A return that looks fine on paper can be close to zero, or below zero, in real terms. This doesn't make cash bad. Cash is the right home for an emergency fund and for money you need soon (see investing money you'll need soon). It just has a cost over long periods that is easy to miss.
Questions to ask yourself
- What do I spend most on, and are those prices rising faster than average?
- Is the return I'm getting higher than inflation, after tax and costs?
- Which of my money do I need soon, and which can I leave for years?
Educational content only. Not investment advice. Examples marked [hypothetical] are made up for teaching and do not show real or expected returns.