The following features are demonstrated in this example:
problem type: linear programming (dynamic Leontief input-output model)
numeric and string index sets
set operator UNION
multiple input data sets
reading dense two-dimensional data
IMPVAR statement
.lb and .ub variable suffixes
IF-THEN/ELSE expression
using the .lb and .ub constraint suffixes to modify the right-hand side of a constraint
multiple objectives
PROBLEM and USE PROBLEM statements
.body constraint suffix