The top headline numbers suggest that the U.S. economic recovery is humming along, but underlying issues throughout the economy have a growing number of economists and market analysts concerned. On the surface, jobs, consumer spending, and the gross domestic product are improving. However, once you begin to scratch underneath that surface, there are plenty of problems threatening the post-pandemic infrastructure, experts warn. Market observers are combing through a series of trends and data points to spotlight core issues that might derail President Joe Biden’s Build Back Better agenda or slow down the post-COVID recovery. And it might be more than inflation. The Labor Market In November, the U.S. economy added 210,000 jobs, falling short of the market forecast of 550,000. The unemployment rate fell to a better-than-expected reading of 4.2 percent. Analysts are looking at the largest context of the jobs market. Average hourly earnings rose 4.8 percent year-over-year, climbing …