param T := 4;
set PROD := bands coils;

param avail :=  1 40  2 40  3 32  4 40 ;

param rate :=  bands 200   coils 140 ;
param inv0 :=  bands  10   coils   0 ;

param prodcost :=  bands 10    coils  11 ;
param invcost  :=  bands  2.5  coils   3 ;

param revenue:   1     2     3     4 :=
       bands    35    36    37    37
       coils    30    35    37    39 ;

param market:    1     2     3     4 :=
       bands  2000  8500  6500  6500
       coils  3000  2500  4500  4200 ;