Inflation

Rate at which the general level of prices rises, eroding purchasing power.

Inflation is the rate at which the general price level of goods and services in an economy increases over time, which subsequently reduces the purchasing power of a currency. When inflation occurs, every unit of currency buys a smaller percentage of a good or service. Central banks monitor inflation closely, typically aiming for a low, stable rate (often around 2%) to encourage economic growth without letting prices spiral out of control. To measure inflation, government agencies track the price changes of a representative basket of goods and services over time, commonly packaged into indexes like the Consumer Price Index (CPI) or the Producer Price Index (PPI). Investors pay close attention to these metrics because inflation directly impacts corporate profit margins, consumer spending habits, and the interest rate decisions made by central banks. For retail investors, high inflation can erode the real, inflation-adjusted returns of their portfolios. Fixed-income investments like bonds suffer because their fixed coupon payments lose purchasing power. While some companies can pass rising costs onto consumers to maintain profitability, others face compressed margins. Conversely, very low inflation or deflation can signal economic stagnation, which also presents challenges for stock market returns.

If a basket of common household goods costs $100 in Year 1 and rises to $103 in Year 2, the annual inflation rate for that basket is calculated as: (($103 - $100) / $100) 100 = 3%. This means an investor's cash lost 3% of its purchasing power over that year.