U. Kohli,, Consistent estimation when the left-hand variable is exogenous over part of the sample period, Journal of applied econometrics , 4(3), 1989, pp. 283-293
This paper proposes a consistent estimation method for regression equations with a left-hand variable that is endogenous for some observations, and exogenous for others. This method is applied to the estimation of a demand-for-money function for Switzerland over a time interval which includes periods of monetary control; that is periods when the quantity of money can best be viewed as exogenous.