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 most common use is to compare products and determine which to keep and which to get rid of. If a productâs contribution margin is negative, the company is losing money with each unit it produces, and it should either drop the product or increase prices. If a product has a positive contribution margin, itâs probably worth keeping.