For more than four years, the unemployment rate has been sliding down — from a 10 percent peak to today's 6.7 percent.
But does that reflect a fast-strengthening economy? Or is the rate falling only because so many people are dropping out of the workforce?
In coming weeks, members of Congress and the Federal Reserve Board will be making big policy decisions based upon their best understanding of those unsettled questions.
"The problem is that there are multiple possible explanations" for why the jobless rate has been falling since 2009, said Ann Owen, a former Fed economist who now teaches at Hamilton College. "There's no one thing that ties it all up" and makes it absolutely clear what is happening.
Even though their understanding of the job market's health may be incomplete, policymakers must make judgments. Here are just two issues hanging in the balance:
Interest rates. The Federal Reserve said in 2012 that it would allow interest rates to rise once the jobless rate fell to 6.5 percent. But as the magic 6.5 percent level draws closer, many people fear the economy is still far too weak to handle higher rates, which would make homes, cars and other purchases less affordable.
Extended unemployment benefits. Democrats plan to push Congress to renew extended unemployment benefits. Many Republicans say that emergency measure, first approved in 2008, is no longer needed. But is it?
As economists sift through the data, these are agreed-upon facts:
In 2007, 66 percent of Americans over age 16 either had a job or were looking for one. Today, that is down to 62.8 percent, the lowest labor-force participation rate since 1978.
When fewer people are in the job market, the unemployment rate can look better. In the past year, the unemployment rate has plunged from 7.9 percent to 6.7 percent.
In December, employers added just 74,000 jobs. But the unemployment rate fell three-tenths of a percentage point as 347,000 people left the labor market.
These are some leading theories to explain the falling jobless rate:
Baby boomers are retiring. The Federal Reserve Bank of Chicago says that except for an uptick during the housing boom, the labor force has been shrinking for a decade because boomers are aging out of the workforce.
Boomers, born between 1946 and 1964, made the labor-force participation rate soar in the 1980s, especially as women started working. Now we are seeing the predictable reversal of that trend, which would have played out no matter what economic policies had prevailed in recent years.
Many economists say retirements are causing about half of the labor force shrinkage. Others say it's 60 percent, and yet others believe it's more like 40 percent.
More people are claiming disability. An economist with the Federal Reserve Bank of Philadelphia says the labor force has been shrinking in part because of soaring Social Security disability claims. And those disabled people are as lost to employers as the retirees.
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What's Behind The Drop In Unemployment