Cournot dupoly: best response functions and isoprofit curves. Created with wxmaxima and enhanced with Gimp and Inkscape: implicit_plot((100-x-y)*x=10000/9,(100-x-y)*x=10000/6,(100-x-y)*x=10000/13.5, (100-x-y)*y=10000/9,(100-x-y)*y=10000/6,(100-x-y)*y=10000/13.5, ,, ,, ,,, ,,], "2 enpresaren erreakzio-funtzioa", "1 enpresaren erreakzio- funtzioa", "Orekako isomozkin-kurba","Mozkin handiagoko isomozkin-kurba", "Mozkin txikiagoko isomozkin-kurba", "Orekako isomozkin-kurba","Mozkin handiagoko isomozkin-kurba", "Mozkin txikiagoko isomozkin-kurba"); After creation, some legends were removed and axis labels were added with image editor.