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.
Contribution Margin Ratio. The contribution margin ratio takes the concept of the contribution margin per unit produced and calculates it as a percentage of the sales price per unit. This shows what percentage of sales is made up of the contribution margin.he contribution margin ratio takes the concept of the contribution margin per unit produced and calculates it as a percentage of the sales price per unit.