Several algorithms have been proposed to solve the harvest scheduling problem when operating under an objective of present worth maximization and given a downward sloping demand function. The Economic Harvest Optimization Model (ECHO) is one such iterative technique which uses a simple recursive relationship to determine successive harvest levels. Convergence difficulties can occur with ECHO as the forest approaches regulation. A formal discussion is presented of the conditions under which the ECHO model might converge to a stable harvest level. FOREST SCI. 23:446-449.