#code for Tahvonen, Voss, Quaas, and Schmidt (2012). Optimal harvesting of an age-structured schooling fishery.
#Environmental and resource economics.
param T := 80;
param n := 8;  
param r := 0.02;
param w:=
        1 0.0053
        2 0.0085
        3 0.0097
        4 0.0103
        5 0.0108
        6 0.0112
        7 0.0113
        8 0.0110;

param q:=

      1 0.31
      2 0.54
      3 0.76
      4 1
      5 1
      6 1
      7 1
      8 1;

param g:=
      1 0.17
      2 0.93
      3 1
      4 1      
      5 1
      6 1
      7 1
      8 1;
         
param a:=		#reference case
      1 0.6703
      2 0.7261
      3 0.7483
      4 0.7558
      5 0.7408
      6 0.7408
      7 0.7189
      8 0.7189;
   
#low cod

#param a:=
       #1 0.7118
       #2 0.7711
       #3 0.7788
       #4 0.7866
       #5 0.7788
       #6 0.7788
       #7 0.7711
       #8 0.7711;

#high cod

#param a:=
 #      1 0.3012
  #     2 0.4360
   #    3 0.5066
    #   4 0.5434
     #  5 0.5016
      # 6 0.4916
       #7 0.4025
       #8 0.4025;





param x0:=
      1 43.895	
      2 56.741
      3 19.540
      4 3.952
      5 1.377
      6 3.846
      7 0.6
      8 0.716;