Implementation Lag
  
Think: Corrective measures of the U.S. Government to try and fix a failing economic cycle.
The data was all there, for quarters at a time. GDP was falling precipitously, from 3.2% to 2.4% to 1.7% to 1.1%. But did The Fed lower rates? Did they go into the markets and inject cash liquidity by buying back their own bonds? No. They did none of that. They didn't even raise the bank multiplier lending limits. They suffered implementation lag in fixing or at least trying to influence a weakening economy.
So the citizens suffered. Thanks, gang.