Total Revenue


Catch I E E2 E31 Effort




 Sustainable
 Yield






 Catch


Figure D-1. Graphical derivation of the double humped sustainable
 revenue curve


 The derivation presented above is based on that given by Anderson

(1973). The double humped revenue curve is derived by choosing a level

of effort and tracing through the various quadrants in a counter-

clockwise fashion. Three such effort levels are depicted in the figure.