8 [3]: p. 8 The term 'endogeneity' in econometrics has a related but distinct meaning.
[4] In the LM model of interest rate determination,[1]: pp.
261–7 the supply of and demand for money determine the interest rate contingent on the level of the money supply, so the money supply is an exogenous variable and the interest rate is an endogenous variable.
An economic variable can be exogenous in some models and endogenous in others.
250–260 derives the market-clearing (and thus endogenous) level of output depending on the exogenously imposed level of interest rates, since interest rates affect the physical investment component of the demand for goods.