At its simplest, inflation is the rate at which the general level of prices for goods and services rises over time. When inflation is at, say, 5% per year, something that cost Rs 100 last year costs Rs 105 today. For households, this erodes purchasing power — the same amount of money buys less than it did before. For investors and markets, however, inflation is significant for a different and deeper reason: it directly influences what central banks do with interest rates, and interest rates are one of the most powerful forces acting on almost every asset class.

Inflation is not just a number on a price index — it shapes interest rates, company earnings, currency values, and the return investors actually receive on their money.

When inflation rises above a central bank's comfort zone, the bank typically responds by raising its benchmark policy rate. Higher policy rates push up borrowing costs across the economy — home loans, business loans, and government borrowing all become more expensive. This tends to slow economic activity, which is the intended effect. But it also makes bonds already in circulation less attractive relative to newly issued bonds at higher rates, so existing bond prices fall and yields rise. Today's session offered a small but real illustration of this dynamic: Indian government bonds ended lower, with the 10-year yield recording its sharpest single-session climb in over two weeks, partly because US Treasury yields remained elevated — a reflection of ongoing global inflation and rate expectations. When US yields rise, Indian bonds must offer competitive returns too, or foreign investors move their capital elsewhere, putting pressure on domestic bond prices.

Equity markets are also sensitive to inflation, though the relationship is more layered. Moderate inflation can be consistent with healthy corporate earnings, since companies may pass on rising costs to consumers. But high or unpredictable inflation squeezes profit margins, raises the discount rate used to value future earnings, and introduces uncertainty that markets generally dislike. Sectors respond differently — commodity producers and certain financials may benefit from a higher-price environment, while rate-sensitive sectors can face pressure. Gold, often watched as a store of value during inflationary periods, was trading at approximately Rs 1,27,245 per 10 grams today, continuing to reflect the elevated price levels seen globally over the past year. Understanding inflation — how it is measured, how central banks respond to it, and how those responses ripple through bonds, equities, and currencies — is a foundational piece of financial literacy for any long-term investor.