Any activity which is occurring outside the system ,and that particular activity also affect the system is known as exogenous activity
whereas endogenous activity are those activity that occur within the system ,and also affecting the system.
Exogenous factors are external influences that affect the experiment, while endogenous factors are internal influences. Exogenous factors come from outside sources, like environmental conditions, while endogenous factors come from within the system being studied. Both types of factors can impact the outcome of the experiment.
Economic activity is the activity in which we work for earning an incom. Non economic activity is the activity wich we do it for our satisfaction.
There is no functional difference; they are the same thing, though they may be applied to differentiate between economic activity between certain groups of states and the world as a whole.
Farming= An activity or business where crops are grown and or livestock is raised for profit. Non Farming= An activity or business which does not perform this
Recession refers to a temporary economic decline whereas a depression is a period of prolonged downturn in economic activity