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.
The contribution margin of one unit is ($100 - $12 - $25 - $10) $53 because the fixed overhead per unit of $8 is not considered. Usefulness of Contribution Margin. Contribution margin is used by management when making pricing decisions. This is especially true in special pricing or special order situations where fixed costs are sunk costs and should not be factored into the decision whether to accept or reject. Negative or low contribution margins indicate a product line or business segment may not be profitable.