INFLATION

Inflation is the rate at which the general price level of goods and services increases over time, reducing the purchasing power of money. It is measured by tracking the prices of a defined basket of goods and services — in the US, primarily through the Consumer Price Index (CPI) and the Personal Consumption Expenditures (PCE) index.

Inflation has multiple causes that operate simultaneously. Demand-pull inflation occurs when aggregate demand exceeds productive capacity. Cost-push inflation occurs when input costs (labor, energy, materials) rise, pushing prices up through supply chains. Monetary inflation occurs when money supply grows faster than real economic output. The 2021-2023 inflation episode involved all three: fiscal stimulus boosted demand, pandemic disruptions constrained supply, and post-2020 monetary expansion had increased the money supply significantly.

Why it matters for investors: Inflation erodes the real value of fixed-income assets and cash. It also complicates equity valuation — higher inflation typically leads to higher interest rates, which increase the discount rate applied to future cash flows, reducing the present value of growth assets. Understanding the inflation environment is essential for asset allocation decisions.

Why it matters for businesses: Inflation affects input costs, wage negotiations, pricing power, and the real cost of debt. Companies with strong pricing power (economic moats) can pass through cost increases; those without face margin compression. The ability to maintain real margins through an inflationary period is one of the clearest tests of genuine competitive advantage.

The measurement problem: CPI and PCE are useful but imperfect. They track a fixed basket that doesn't fully capture substitution behavior, they lag real-world price changes, and they weight categories (housing, healthcare) in ways that diverge from the actual spending patterns of different income groups. For investors and operators, the practical inflation rate that matters is the one affecting their specific input and output mix — which can diverge significantly from headline CPI. A technology company whose primary inputs are cloud compute and engineering salaries faces a different inflation environment than a restaurant whose inputs are food, energy, and hourly labor, even when reported CPI is identical.

Inflation expectations as a self-fulfilling mechanism: Central banks focus heavily on inflation expectations because they become self-fulfilling. When workers expect 5% inflation, they negotiate for 5% wage increases; when businesses expect 5% input cost increases, they raise prices preemptively. Keeping expectations anchored near the target rate (typically 2%) is why central banks communicate so carefully about their intentions — credibility is the monetary policy transmission mechanism.