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 $10 per unit would equal the Division's variable costs ($5 + 2 + 3 = $10), so the contribution margin per unit is zero. Thus, only the 8,000 units of external sales would generate a contribution margin of $80,000 (8,000 ï´ $10) to cover fixed costs of $90,000 (10,000 ï´ $9).