!exogenous_variables
VariableName, VariableName, ...
...
!exogenous_variables
VariableName, VariableName, ...
'Description of the variable...' VariableName
!exogenous_variables
VariableName, VariableName, ...
VariableName = Value
The !exogenous_variables
keyword starts a new declaration block for exogenous variables, i.e. variables that can appear only in !dtrends
equations. The names of the variables must be separated by commas, semi-colons, or line breaks. You can have as many declaration blocks as you wish in any order in your model file: They all get combined together when you read the model file in. Each variable must be declared (exactly once).
You can add descriptors to the variables (enclosed in single or double quotes, preceding the name of the variable); these will be stored in, and accessible from, the model object. You can also assign steady-state values to the variables straight in the model file (following an equal sign after the name of the variable); this is, though, rather rare and unnecessary practice because you can assign and change steady-state values more conveniently in the model object.
!exogenous_variables
X, 'Tax effects' Y
'Population growth effects' Z = 0 + 0.5i;