What, and where, is a Negative Output Gap?

-This [Recesionary Gap] is the Difference between Actual Output [GDP] and Trend Output [Average Economic Growth] Acutal Output will be Below Trend Output -Happens in a Rescession when the Economy is performing Poorly - Resources not used fully - like Labour [Unemploymnet] -This also puts Downwards Pressure on Inflation [Demand is Falling and % Rates may be low]