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Keep purchase quantity separate from forecast demand
Suppose the supplier’s cheaper price requires buying more than your supported demand for the first period. The owner is deciding whether to commit that extra money, not calculating a universal minimum order or safety-stock level.
Virginia Tech’s inventory chapter distinguishes purchase, ordering and holding costs. Its industry examples and inventory formulas do not provide demand, storage cost or an optimal order quantity for this U.S. business.
The discount saves unit cost but uses more cash
Fictional three-month example, all amounts in U.S. dollars: assume 200 units are used or sold in the period. Normal purchases are two orders of 100 units at US$50. A bulk offer requires 300 units at US$44. The chosen holding-cost budgets are US$400 and US$900 respectively, with all those costs paid in the period.
| Chosen-period comparison | Two 100-unit orders | One 300-unit order |
|---|---|---|
| First goods purchase | 5,000 | 13,200 |
| Second goods purchase later in the period | 5,000 | 0 |
| Holding costs paid | 400 | 900 |
| Total specified cash outlays | 10,400 | 14,100 |
| Units left after 200 are used/sold | 0 | 100 |
Explain both the saving and the extra commitment
The bulk option pays US$3,700 more during this period. It also leaves 100 units originally bought for US$4,400. That amount is not guaranteed sale value or bank cash. Do not count the unsold units as both a total loss and a recoverable asset without deciding what the real evidence supports.
For the 200 units actually used, the chosen purchase cost plus holding budget is US$9,700 under bulk buying: 200 times US$44 plus US$900. It is US$10,400 under normal buying. The US$700 difference is narrower than a complete profit comparison and does not remove the extra cash commitment.
Ask what happens if the extra units do not sell
Check condition, shelf life or version changes, storage capacity, return terms and realistic demand beyond the first period. Include actual ordering, freight, finance and other costs omitted here. A price reduction is less useful if the extra units become unusable.
Compare dates as well as totals: the bulk purchase is paid earlier, while a later normal order may be funded by earlier customer receipts. Keep a dated stock/purchase sheet beside Cash runway. Do not enter an economic holding-cost assumption as a second cash payment if it is already included in rent or another recorded outflow.
Scope
- All quantities, demand and costs are fictional. No standard carrying-cost rate, stock valuation, tax deduction, return right or recommended inventory level is supplied.
Next step
Prepare the smaller and bulk purchase schedules, identify the unsold remainder and funding dates, then compare the actual monthly cash effect before approving a supplier minimum.
Sources & review notes
Virginia Tech — Virginia Cooperative Extension
Passage, dates and research notes
public-university-guidance · Inventory costs; purchase-quantity and carrying-cost trade-offs
Read the cost discussion and model assumptions. No universal order quantity, buffer, carrying-cost rate or forecast demand is supplied.
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