| Warehouse rent ($4,500/month) |
Fixed |
Include as monthly overhead from Month 1 through Month 60; it does not move with basket count within the current space. |
Spreading rent per basket and hiding low-volume risk. |
| E-commerce platform fees ($450/month) |
Fixed |
Keep the base platform charge in fixed overhead before calculating contribution margin. |
Treating every platform charge as transaction-driven. |
| Warehouse utilities ($800/month base) |
Semi-variable |
Model the $800 base as committed overhead, then add usage if higher order volume drives more warehouse activity. |
Assuming utilities stay flat at much higher volume. |
| Salaried roles and support headcount |
Semi-fixed |
Add salaries by full-time equivalent; support headcount starts after Month 13 and rises as volume grows. |
Treating added support headcount as pure overhead with no step change. |
| Unit basket inputs ($9.00 to $28.00 per basket) |
Variable |
Apply sourced goods, packaging, cards, and assembly labor to each basket sold based on product mix. |
Ignoring packaging per basket and overstating margin. |
| Revenue-linked COGS (8.0% of revenue) |
Variable |
Include licensing, transaction fees, quality control labor, inventory insurance, and spoilage as a percent of sales. |
Leaving percentage COGS out of contribution margin. |
| Digital marketing ads (10.0% of first-year revenue) |
Variable |
Model ads as revenue-linked demand spend, falling to 8.0% by the mature year. |
Treating digital ads as fixed and missing margin pressure. |
| Outbound shipping subsidy (4.0% of first-year revenue) |
Variable |
Deduct the subsidy from contribution margin; it falls to 2.0% by the mature year. |
Counting shipping help below the break-even line. |