The allowable cut effect in harvest scheduling problems stems from the constraints which link harvests between periods. Historically, allowable cut effects have been associated with even flow constraints, but this is only one example of a more general situation. This paper describes two generic problems where allowable cut effects arise without any flow constraint. Allowable cut effects are a general part of the harvest scheduling problem. Valid economic analysis of forest management programs requires the inclusion of the positive or negative incomes associated with them.