Inflation, at its simplest, is a sustained rise in the general price level of goods and services in an economy. When inflation is high, each unit of currency buys less than it did before. Central banks in most countries, including the Reserve Bank of India, the US Federal Reserve and the Bank of England, are mandated to keep inflation within a defined range, typically around 2 to 4 percent annually. When inflation moves well above that range, central banks generally respond by raising interest rates, which makes borrowing more expensive and is intended to slow spending and cool price pressures. Today's global headlines offer several live illustrations of this dynamic: UK inflation climbed to 3.5 percent in September, above expectations, and markets immediately began pricing in a higher likelihood of another Bank of England rate increase. Similarly, the Bank of Japan's deputy governor flagged that inflation there is approaching the 2 percent target, reinforcing expectations of further rate hikes in a country that had kept rates near zero for decades.

When prices rise persistently across an economy, the effects ripple through bond markets, currencies, central bank decisions and eventually equity valuations.

For equity markets, rising interest rates triggered by inflation have multiple effects. When rates go up, the cost of borrowing for companies increases, which can compress profit margins. Additionally, higher rates make fixed-income instruments such as bonds relatively more attractive compared to equities, which can cause investors to shift allocations. Perhaps most importantly, the standard method for valuing a company involves discounting its future earnings back to the present using an interest rate. When that rate rises, future earnings are worth less in today's terms, and share prices can come under pressure as a result. This effect tends to be more pronounced for sectors whose valuations rely heavily on earnings projected many years into the future, such as technology companies, though markets weigh many factors simultaneously.

Inflation also has a direct bearing on currencies and commodities. Brent crude ended the Indian session at 108.20 US dollars per barrel, remaining elevated by historical standards. For India, which imports a large share of its oil needs, high crude prices feed directly into domestic inflation by raising the cost of fuel, transportation and manufacturing inputs. A weaker currency compounds this effect, because imports become more expensive in rupee terms even if the dollar price of oil stays flat. This is part of the reason currency stability, the RBI's policy decisions and global commodity prices are tracked so closely by Indian market participants. Understanding inflation is therefore not just an academic exercise; it is central to making sense of why bond yields move, why central banks act as they do, and why commodity prices and exchange rates matter to the broader economy.