There's a dirty little secret buried in the monthly employment data. It's a secret so dark, so exquisitely threatening to the financial media industry that those who reveal it risk being expunged from the community like magicians revealing their tricks. The National Bureau of Labor Statistics reported that 192,000 jobs were added to the economy in March. The unemployment rate stayed flat at 6.7%. The participation rate rose to 63.2%. Now the dirty secret: none of that actually matters very much. 1.The number itself is simply impossible to measure with any accuracy ... 2.The unemployment rate is irrelevant. ... 3.No...