Topic summary
Exogenous variable
Extracted from the Wikipedia article Exogenous and endogenous variables.
In an economic model, an exogenous variable is one whose measure is determined outside the model and is imposed on the model. An exogenous change is a change in an exogenous variable. In contrast, an endogenous variable is a variable whose measure is determined by the model. An endogenous change is a change in an endogenous variable.