Primary Recession Indicators
Primary indicators are the signals with the strongest historical track record for calling US recessions — the Sahm Rule, the 2s10s yield curve, and the Conference Board LEI 3Ds rule have each flagged every NBER-dated recession since 1970 in real time.
Why this category matters
Primary indicators deserve more weight than any other category because they are the ones Wall Street, the Fed, and the NBER itself watch. When multiple primary indicators flash red at the same time, the base-rate probability of a recession within 6–18 months climbs above 70%.
How to read it
Read primary indicators as a breadth signal: a single primary signal flashing red is a warning, two is a confirmation, three or more is nearly deterministic. Focus on trend direction over the past 3-6 months rather than a single print.
Historical lead time
Primary indicators lead recessions by 6–18 months on average. The yield curve typically leads the deepest, at 12–18 months before the first quarter of contraction.
Indicators in this category
Safe — below trigger
Normal spread
Normal
Positive
Below trend — monitor
Ticking up
$16.7T annualized — monitor trend
Stagnant output
Below pre-pandemic norm
Sharp decline — recession leading signal
5.4% — low risk
Low insured unemployment
Frequently asked questions
Which primary recession indicator is most reliable?
The Sahm Rule has the cleanest historical record — it has signaled every US recession since 1970 in real time with zero false positives, triggering when the 3-month moving average of the unemployment rate rises 0.5 percentage points above its 12-month low.
How far in advance do primary indicators warn of recession?
Primary indicators typically lead recessions by 6 to 18 months. The 2s10s yield curve leads the deepest at 12-18 months, while the Sahm Rule tends to trigger closer to or just after the cycle peak.