What is purchasing power?

Imagine you have a ₹500 note in your wallet today. You go to your favorite local eatery and buy five plates of vada pav. You feel good. You have "five plates of wealth."

Now, imagine you take that same ₹500 note, put it in a box, and bury it in your backyard. You dig it up twenty years later. The note is still there. It still has the same blue color. The number "500" hasn't changed. But when you go to that same eatery, you find that ₹500 now only buys one plate of vada pav.

Your money is the same. But your purchasing power has evaporated. This is the single most important concept in personal finance, yet it's the one most people ignore until it's too late.

Wealth is stuff, not numbers

Purchasing power is the amount of goods or services that one unit of currency can buy. In other words, wealth isn't the number of Rupees in your bank account; it's the amount of "stuff" those Rupees can be traded for.

Most of us suffer from "money illusion." We feel wealthier because our salary went up by 10%. But if the cost of living—rent, fuel, and data plans—also went up by 10%, our purchasing power has stayed exactly the same. We are running on a treadmill, seeing the distance increase, but staying in the same spot.

The relationship with Inflation

If purchasing power is the "value" of your money, inflation is the fire that consumes it. Inflation and purchasing power are two sides of the same coin. When one goes up, the other must go down.

In India, we have historically faced significant inflation. This means the "halflife" of our money is shorter than in some other parts of the world. A middle-class Indian family saving for a child's education twenty years from now isn't saving for a degree; they are saving for a certain amount of purchasing power in an unknown future.

Why it matters for your future

This is why "saving" is often not enough. If you save money in a medium that doesn't grow (like cash or a very low-interest account), you are effectively losing wealth every single day. To maintain your standard of living, your money must work as hard as you do.

• Real Returns: The only number that matters is your return minus inflation.
  Real Return = Nominal Return (FD Rate) - Inflation Rate
  If your FD gives 7% and inflation is 6%, your real gain in purchasing power is only 1%. That's the actual growth of your wealth.
• Protecting the Future: Your goal in investing isn't to get a high number; it's to ensure your future self can afford the same quality of life as your current self.

Key Takeaway

Stop measuring your success by your balance. Measure it by your freedom. And freedom is measured by how much of the world your money can command. Keep your purchasing power strong, and your future will take care of itself.