Moody’s chief economist Mark Zandi has introduced a new recession indicator that aims to capture something he believes the headline unemployment rate is now missing. Called the Vicious Cycle Index, the measure is built around a simple concern: the labor market may be weaker than it looks if people are quietly dropping out instead of remaining in the workforce and showing up as unemployed.
That matters because the unemployment rate, while still low by historical standards, can sometimes hide discouragement rather than reveal it. If people stop actively looking for work, they no longer count as unemployed. In that case, a relatively stable unemployment number can coexist with a more fragile reality underneath, where job creation is weak, participation is falling and confidence in the labor market is eroding.
Zandi’s new index is an attempt to measure that hidden slack more directly. He argues that recession warnings should not rely only on unemployment, but also on the labor force participation rate, which tracks how many people are working or actively seeking work. When both job growth and participation weaken together, the economy may be sending a darker signal than the headline numbers suggest.
Why Zandi thinks the old signals are incomplete
The core idea behind the Vicious Cycle Index is that unemployment alone no longer tells the whole story. In March, the U.S. unemployment rate stood at 4.3%, just 0.1 percentage point above where it was a year earlier. On its face, that does not look like an economy falling into recession. But participation has moved much more sharply, dropping by about half a percentage point over the same period.
That divergence is exactly what concerns Zandi. A falling participation rate can mean workers are becoming discouraged and exiting the labor force instead of continuing to search for jobs. If that is happening, then the unemployment rate may look calmer than the labor market really is.
He argues that the combination of flat job growth and declining participation suggests a level of slack that the standard unemployment number is failing to capture. In his reading, workers are not simply struggling to find jobs. Some are giving up on the search altogether.
Older Americans are showing sharper weakness
One of the more striking details in the data is that the participation decline has been even steeper among older Americans. According to the source material, that rate has now fallen to its lowest point since 2005. That makes the broader participation story more serious, because it suggests the weakness is not evenly distributed but is hitting some parts of the labor force harder than others.
This trend could reflect several overlapping forces. Some older workers may be retiring earlier than expected. Others may be struggling to reenter the workforce after layoffs or career interruptions. Still others may simply conclude that the current job market no longer offers opportunities worth pursuing.
Whatever the mix of causes, the result is the same from a macroeconomic standpoint. A shrinking labor force can distort the picture presented by unemployment while also reducing household income potential and weakening demand over time.
How the vicious cycle is supposed to work
Zandi’s framework is based on a familiar recession dynamic. The labor market softens, workers become worried about job security, and households begin pulling back on spending. That reduced spending weakens the economy further, prompting more caution from consumers and businesses. The process feeds on itself until a slowdown becomes much harder to stop.
The index is meant to identify the point at which that spiral may be starting, especially when discouragement is spreading through the labor force. Instead of waiting for unemployment alone to jump, the measure looks at weakening participation as an early sign that labor market stress is already feeding into broader economic behavior.
Zandi says that when he looks backward, the index appears to have correctly signaled past recessions. Still, he is also careful to describe the measure as experimental and says he does not want to put too much weight on it yet. In other words, he sees it as a useful warning tool, not as a definitive recession call.
It is also a response to broken old rules
The Vicious Cycle Index is partly an effort to improve on older recession indicators that have become less reliable in the post-pandemic economy. One obvious reference point is the Sahm rule, which says the economy is likely in recession when the three-month average unemployment rate rises by 0.5 percentage point over the prior year. That rule did not work well in 2024 because a wave of new labor force entrants, especially immigrants, pushed unemployment higher without signaling broad distress.
Zandi’s approach tries to solve that weakness by bringing participation directly into the picture. Claudia Sahm herself reportedly sees the logic, describing labor force dynamics as a real vulnerability in the traditional rule. Her reaction suggests the new measure is not being dismissed as gimmicky, even if it is still at an early stage.
That said, most other evidence still argues against declaring a recession now. Consumer spending remains resilient, capital investment is strong and the AI data center boom continues to support growth in parts of the economy. Moody’s own recession odds model currently puts the risk at 45%, which is elevated but still short of a base case downturn.
The labor market is still sending a mixed message
The larger story is that the U.S. economy has become unusually hard to read through labor data alone. Post-pandemic distortions, shifting immigration patterns and inconsistent job creation have made old signals less dependable than they once were. That is why economists are experimenting with new frameworks, even if those tools are still rough and evolving.
Zandi’s indicator captures that uncertainty well. It does not prove a recession has begun, and even he is not claiming that. But it does suggest that the labor market may be more fragile than the unemployment rate alone implies. If workers are becoming discouraged and stepping away from job searches, that is a warning worth taking seriously.
The value of the Vicious Cycle Index may therefore be less about predicting an exact recession date and more about forcing a closer look at what the labor market is hiding. The official numbers still say the economy is holding up. Zandi’s message is that the underlying mood may be telling a different story.