What to remember
- Entered and sourced volume
- Variable costs separated from fixed costs
- Explicit discounts and promotions
- Break-even calculated for each scenario
The minimum variables
Every scenario should use the same units and period. Separate list price from net price, then connect discounts, promotions and commissions to their calculation rules.
| Variable | Definition | Caution |
|---|---|---|
| Net price | Price actually collected per unit | Include discounts and terms |
| Volume | Quantity sold during the period | Assumption to justify |
| Variable cost | Cost that changes with volume | Use the same unit as price |
| Fixed costs | Costs independent of short-term volume | State scope and period |
| Promotion | Expense or discount linked to the scenario | Avoid double counting |
Calculate margin and break-even
Unit margin is net price minus unit variable cost. Total margin is unit margin multiplied by volume. Break-even in units divides fixed costs by unit margin, provided the margin is positive.
These simple formulas should remain visible. A scenario that mixes volume, product mix and period effects without detail is difficult to audit.
- Unit margin = net price − unit variable cost
- Total margin = unit margin × volume
- Result = total margin − fixed costs − specific expenses
- Break-even = fixed costs ÷ unit margin
Compare without inventing elasticity
To assess a price reduction, build several volume assumptions and show the threshold needed to offset the lower unit margin. Observed elasticity can then narrow the plausible range.
This turns an implicit promise into a testable question: what volume increase is actually required, over which period and with what level of confidence?
The roles of Mix and Calc
Mix is used to enter and compare commercial assumptions for price, volume, cost, discounts and promotion. Its deterministic engine measures their consequences.
Calc complements the approach when formulas, indicators or scenario gaps need broader documentation and audit. Field validation then qualifies demand assumptions.
Frequently asked questions
How can volume be connected to price?
A documented elasticity model can establish that relationship. When observations are missing, several volume assumptions make the thresholds comparable.
How should a temporary promotion be handled?
Separate its period, cost, net discount and any displacement effect on following periods.
What is the difference between gross margin and contribution?
The definition depends on the cost scope. State which costs are included before comparing scenarios.