A socio-ecological system consists of 'a bio-geo-physical' unit and its associated social actors and institutions.
Contribution Margin. Contribution margin is a productâs price minus all associated variable costs, resulting in the incremental profit earned for each unit sold. The total contribution margin generated by an entity represents the total earnings available to pay for fixed expenses and to generate a profit. The contribution margin concept is useful for deciding whether to allow a lower price in special pricing situations.
Sales price per unit-Variable cost per unit = Contribution margin per unit. Contribution margin ratio. The amount of cents of every sales dollar available to cover fixed costs and to contribute to profit. (Sales price per unit-Variable cost per unit) / Sales price per unit = Contribution margin ratio.ales revenue-Total variable costs = Contribution margin. Contribution margin per unit. The amount from the sale of each unit that is available to cover fixed costs and to contribute to profit.