A supplier sends a revised quotation with an 8% increase and a short explanation: “Market prices have risen.” Before accepting or rejecting it, identify the market and the cost that actually changed. A raw metal price does not necessarily move like the price of a manufactured component. A commodity-group average cannot automatically represent an item bought to a particular specification, contract and delivery arrangement.
GASTAT's Wholesale Price Index describes price movements for goods before the retail stage. For a buyer, it provides context for comparison and questions, not a compulsory supplier price list. Select the category closest to your purchases and a matching comparison period, retaining the release date and index definition. Comparing this month's quotation increase with a broad annual rate is not conclusive evidence that the quotation is fair or unfair.
Did the price rise, or did the basket change?
A business bought 1,000 units at SAR 40 each in one period, then 1,200 units at SAR 43 in the next. Purchase expenditure rose from SAR 40,000 to SAR 51,600: an increase of 29%. The unit price, however, rose by only 7.5%. Much of the expenditure increase reflects quantity rather than unit-cost inflation.
Separate the effects by valuing the extra quantity at the old price: 200 additional units × SAR 40 = SAR 8,000. Then calculate the price effect on the new quantity: 1,200 × SAR 3 = SAR 3,600. Together they explain the SAR 11,600 increase. This proposed decomposition assigns the interaction between price and quantity changes to the price component; it is not the only valid way to present variances.
When the product mix changes, compare homogeneous items individually instead of dividing total spend by total units. An average treating a large carton and a small pack as equivalent units is not useful. Align units of measure, quality, discounts and delivery terms before calling a supplier expensive. Exclude recoverable tax from the purchase-cost comparison where recovery conditions are satisfied, while keeping the cash payment visible in liquidity planning.
Where should negotiation effort go?
Start with items combining substantial purchasing exposure and limited supplier alternatives. A small increase in an essential material can matter more than a dramatic increase in an infrequently used consumable. Give each priority item a short record showing expected spend, qualified alternatives, lead time, existing stock cover and the ability to pass additional cost into selling prices.
A single-source item with stable demand may justify work on alternative supply or price-review terms. A seasonal item exposed to rapid obsolescence needs a different response: buying heavily before a predicted increase can protect unit cost while creating stock that will not sell. Do not compress both situations into a generic “price inflation” warning. Their decisions and supporting evidence differ.
Does buying early really save money?
Suppose bringing forward a purchase of 500 units saves SAR 2 per unit, or SAR 1,000. If estimated incremental storage and funding costs are SAR 600, and expected deterioration losses are SAR 500, the net result is a SAR 100 disadvantage before other benefits or risks. These are decision estimates, not automatic accounting entries. Support them with the holding period, product behaviour and funding terms.
Early purchasing might still make sense if it prevents an expensive operational interruption. Separate that continuity benefit from the discount saving. Where reliable data are unavailable, show a lower and higher cost scenario rather than concealing uncertainty behind a single apparently precise number.
What should you ask the supplier for?
Request a comparable quotation specifying price validity, quantity, minimum order, freight and payment terms. If a contract links prices to an index, define the category, source, comparison period, adjustment formula and limits rather than relying on “market price.” Obtain appropriate contractual review before adopting such terms. An index does not itself create a right to change an existing agreement.
After the decision, preserve both the expectation and the outcome. Did the saving materialise? Did storage days increase? Did quality or returns change? A useful risk map is not a permanent display of coloured labels. It records why the purchase was made and what the business learned once the goods arrived and began to sell.
Sources & further reading
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General educational content. Appropriate treatment depends on your business and accounting policies; consult your accounting professional when applying it to business records.
