← Every exhibit
Which operational miscalculations undermine contribution margin analysis?
| Miscalculation | Root cause | Operational failure | Corrective protocol |
|---|---|---|---|
| Treating step-fixed costs as purely variable | Assuming hosting or support costs scale smoothly per user | Underestimates capital needed when customer growth triggers major infrastructure tiers | Model step-fixed cost jumps at defined capacity thresholds |
| Omitting variable sales commissions | Recording sales incentives exclusively as general SG&A | Distorts incremental deal economics during promotional discounting | Deduct deal-contingent commissions directly in CM I |
| Arbitrary corporate overhead allocation | Allocating HQ rent and executive salaries down to SKU margins | Distorts marginal pricing; profitable products are prematurely killed | Confine overhead to corporate level; never allocate to unit CM I |
| Ignoring customer servicing variance | Applying a flat gross margin percentage across all accounts | Masks margin destruction caused by demanding enterprise accounts | Measure activity-based customer support hours in CM III |
| Confusing CM percentage with total CM dollars | Prioritizing high-margin low-volume niche products | Rejects high-volume, lower-percentage contracts that deliver superior total cash | Maximize absolute contribution margin dollars within capacity constraints |
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Reference & Evidence
Source: Table from this essay. Sources and interpretation are given in the article.