Business Cycle Indicators
Forecasting recessions has been called the dismal science's dismal task. Yet a consistent set of indicators leads, coincides with, or lags the business cycle. Yield curve inversion has been the most reliable single leading indicator. Coincident indicators (employment, industrial production) confirm what's happening now. Lagging indicators (unit labor costs, inflation) reflect past dynamics.
Key insights
Yield curve has been the canonical leading indicator
Inversion of the 10-year minus 3-month Treasury yield curve has preceded every US recession since 1969 — 8 of 8. False positives: 1966 inversion didn't lead to recession (most disputed); 2022-23 inversion has not yet produced a recession through 2024 (the longest non-recession period after inversion in history). Whether the indicator is still working or has been broken by Fed balance sheet operations is the main current debate.
PMIs are real-time global pulse indicators
Purchasing Managers' Indices survey procurement managers about new orders, production, employment, supplier deliveries, inventories. The composite reading above/below 50 separates expansion from contraction. Manufacturing PMIs lead; services PMIs are more coincident. Global PMI is published monthly within 5-7 days of month-end — far faster than GDP statistics.
The Sahm Rule fires cleanly at recession onset
Claudia Sahm's rule: a recession is essentially confirmed when the 3-month average of unemployment rises 0.5pp or more above its trailing 12-month low. The rule has fired correctly at every US recession since 1959 with no false positives. It fired in 2024 — though some debate whether the signal is biased by post-pandemic labor force dynamics. Used by Fed and FOMC members for real-time recession monitoring.
US 10y-3m Treasury yield spread 2000–2024
Percentage points
Key Finding: Negative (inverted) values have preceded recessions. The 2022-23 inversion was the deepest since 1981.
Global manufacturing PMI 2018–2024
S&P Global Manufacturing PMI, monthly
Key Finding: Drops below 50 mark slowdowns; 2020 COVID drop was deepest since 2008. Currently hovering around contraction.
Methodology & caveats
Conference Board LEI
The Conference Board's Leading Economic Index combines 10 indicators: average weekly manufacturing hours, initial jobless claims, manufacturer orders, ISM index, building permits, stock prices, leading credit index, yield spread, consumer expectations, ISM index. A 6-month decline often precedes recessions; the indicator has produced false positives but few false negatives.
Why leading indicators fail
Leading indicators can fail when: structural changes alter relationships (yield curve and central bank balance sheets), data series are revised after the fact, the signal-to-noise ratio is low at small inversions, real-time data is mismeasured. The trick is using multiple indicators that fail under different conditions — diversification of signals reduces false positives.
Real-time vs revised data
Many recession-call methodologies use revised data that wasn't available at the time. Real-time monitoring requires using vintage data — what was published when. ALFRED (Archival Federal Reserve Economic Data) captures real-time vintages. Many backtests of recession indicators look better than they performed in real-time.