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ENDO and EXO are used for fixing, that is, setting variables to some values (goal), and asking the system to solve this by means of other variables (means). The EXO command works differently depending upon OPTION model type.
•With OPTION model type = default, EXO exogenizes a list of variables (without date settings). A model must be defined beforehand.
•With OPTION model type = gams, EXO produces array-series with names starting with 'exo_'. These array-series can subsequently be used to tell e.g. GAMS which variables are fixed and non-fixed. EXO must indicate dates.
Use UNFIX to remove previously set ENDO or EXO variables.
Regarding syntax, examples, etc., see the ENDO command.
OPTION model type = default; //default | gams