Overview
This series explains why the Federal Reserve pairs a modal baseline with alternative scenarios: one forecast organizes judgment, but cannot show every consequential way the economy could depart. It distinguishes fan charts, qualitative risk discussions, conditional paths, and policy-response scenarios; traces demand, supply, financial, external, fiscal, and expectations channels; follows the practice from 1968 through the public record to 2020; and tests what retrospective comparisons can and cannot show. The result is a practical way to read mechanisms, output–inflation trade-offs, selection and severity, and model-dependent policy responses without treating a scenario as a probability or promise.
Learning outcomes
- The Federal Reserve's baseline organizes judgment, while alternative scenarios expose consequential departures from it.
- Fan charts show general spread; scenarios make a selected risk and its transmission path concrete.
- Different shocks can produce the same inflation outcome with different GDP and policy trade-offs.
- Historical comparisons show retrospective plausibility, not probabilities or proof that scenarios improved policy.
Keywords
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PlansFAQ
Why does the Federal Reserve use alternative scenarios?
The Federal Reserve uses alternative scenarios to show how identifiable risks could move the economy away from its baseline. They keep assumptions and policy trade-offs visible without claiming the branch is most likely.
How does an alternative scenario differ from a fan chart?
An alternative scenario traces a specified risk or structural change through a conditional path, while a fan chart mainly shows the general spread around a forecast. Neither by itself supplies probabilities for every outcome.
Why can the same inflation outcome imply different policy choices?
The same inflation outcome can reflect different shocks: stronger demand may raise GDP, while weaker supply may lower it. Those different transmission paths create different inflation–activity trade-offs.
What does the Federal Reserve's scenario history show?
The Federal Reserve's historical evaluation shows whether a path later looked close under a chosen metric; it does not establish an ex-ante probability, prospective forecasting skill, or a policy effect.