"1. If the size of the U.S. labor force as a share of the total population was  the same as it was when Barack Obama took office—65.7 percent then vs. 63.7 percent today—the U-3 unemployment rate would be 11.0 percent.

2. But let’s not go all the way back to January 2009. In January 2011, the unemployment rate was 9.1 percent with a participation rate of 64.2 percent. If that were the participation rate today, the unemployment rate would be 8.9 percent, instead of 8.3 percent. As an analysis from Hamilton Place Strategies concludes, “Most of the shift of the past year is due not to the improvement in the labor market, but the continued drop in participation in the labor force.”

3. Now, to be fair, some of the decline in the participation rate is aging Baby Boomers dropping out of the labor force. But taking that into account still doesn’t get us very far, as HPS notes:

Demographic projections expect that participation rate to be at 65.3 percent. If that full participation rate is the goal, our economy is “missing” 3.8 million workers, up from the 3.4 million we noted in the white paper. The unemployment rate in that context has not budged at 10.4 percent."

Economist Brian Wesbury accounts for the fact that the Bureau of Labor Statistics adjusted its working age people numbers in January but I don't think Wesbury's point resonates when you go back beyond two years.  Worth reading here.

If I am missing something, I am open to suggestion on this.