Lecture: Understanding Inflation Expectations

LECTURER: One of the more counterintuitive lessons of modern macroeconomics is that inflation is, to a significant degree, a self-fulfilling prophecy. If businesses expect prices to rise, they raise their own prices pre-emptively; if workers expect inflation, they demand higher wages; and if consumers expect prices to climb, they accelerate purchases, increasing demand. Each of these responses, individually rational, collectively produces the very inflation that was feared. This is why central banks devote enormous energy to managing expectations — not just actual monetary conditions. The phrase 'anchored expectations' refers to a state in which the public believes inflation will remain close to target regardless of short-term fluctuations. When expectations are anchored, a temporary supply shock — an oil price spike, say — causes a one-off price adjustment rather than a wage-price spiral. When expectations become unanchored, even a modest shock can trigger persistent inflation, because every price increase is interpreted as evidence that more increases are coming.