A quotation that looks complete

A purchasing team receives three quotations for a molded plastic zipper for a padded outerwear program. The prices are close, the payment terms are similar, and the delivery windows overlap. The buyer compares the unit price column, selects the lowest offer, and issues the purchase order. Six weeks later the goods arrive with a water-repellent finish that nobody remembers ordering, a slider that has been changed to a different model, and an invoice that is noticeably higher than the quotation. The argument that follows is not really about money. It is about the fact that the quotation described a base product, while the purchase order described a finished one.

This is one of the most common sourcing failures in the zipper trade, and it almost never comes from dishonesty. It comes from two documents that were written at different levels of detail and were never reconciled.

Typical scenario

The enquiry goes out as a simple request: price per meter or per piece, for a given size and type. The supplier quotes the standard configuration, because that is what the standard price list supports. During sampling, the design team asks for a matte tape, a narrower slider body, a lacquered puller in a specific color, and a water-repellent treatment on the tape. Each of these is a functional change. Each carries a real cost: an extra process step, a lower line speed, a higher defect rate, or a material that is bought in smaller quantities.

The sample is approved, the order is placed at the quoted unit price, and the supplier absorbs the difference on the first shipment because the relationship matters. On the second shipment the surcharges appear, itemized in a way that looks like a price increase. The buyer sees a supplier who "changed the price after winning the order." The supplier sees a buyer who ordered a custom product at a catalogue price. Both are describing the same event from different documents.

Root cause

Three structural problems sit underneath the dispute.

  • The enquiry asked for a price, not for a specification. Without a written configuration, the supplier is free to quote the cheapest interpretation that still satisfies the words on the page.
  • Functional surcharges are not part of the base price list. Water repellency, anti-static treatment, low-lead plating, reflective tape, heat-shrinkable ends, and special slider finishes are all add-on processes that are quoted separately, or not at all.
  • Sampling and pricing were handled by different people. The sample room builds what the customer asked for; the sales office prices what the catalogue contains. Nobody is responsible for making the two agree.

The result is a quotation that is internally consistent and commercially incomplete. It is not wrong. It is just not the product that will be shipped.

Loss pattern

The losses rarely appear as one large number. They arrive in a sequence.

  1. Price renegotiation under time pressure. The surcharge is discovered after the sampling deadline, when switching suppliers would delay the line. The buyer accepts the increase because the alternative is worse.
  2. Silent substitution. To hold the quoted price, the supplier removes a feature that was never written down: a cheaper slider, a thinner tape, a standard finish instead of the matte one. The garment passes inspection because nobody defined what to inspect against.
  3. Cost per garment drift. Even when the unit price holds, the consumption per garment may rise because the approved zipper is narrower or the tape is stiffer and requires more handling. The trim cost per piece moves without any single invoice looking unusual.
  4. Audit exposure. If the finished product carries a claim such as water repellency, and the zipper was downgraded to a non-treated version, the claim becomes unsupported. That is a commercial risk far larger than the surcharge that started the argument.

Prevention

The fix is a quotation format, not a negotiation skill. Every quotation should be structured so that the base price and each functional addition are visible on the same page, and the purchase order should reference the quotation line by line.

A workable contract clause reads: "The unit price shall be quoted as a base configuration plus separately itemized functional surcharges. Any feature specified in the approved technical sheet that is not listed as a surcharge shall be deemed included in the base price. No surcharge may be introduced after order confirmation except for a change requested in writing by the buyer."

Alongside the clause, a short checklist prevents most of the damage:

  • Does the enquiry include a technical sheet with tape width, slider model, puller finish, tape treatment, and end treatment?
  • Does the quotation break out every optional process as a separate line with its own unit price?
  • Is the approved sample labelled with the exact configuration it represents?
  • Does the purchase order restate the configuration rather than referring only to a sample number?
  • Is there a rule that any configuration change after order confirmation requires a written price confirmation before production starts?

Remediation

When the gap has already appeared, the useful move is to rebuild the comparison on a like-for-like basis rather than argue about the number. Request a cost breakdown for the delivered configuration, compare it against the original base quotation, and identify which line items were genuinely new requirements introduced by your own design team. In most disputes, part of the surcharge is legitimate and part is a supplier recovering costs that should have been quoted at the start.

For the current order, agree in writing which configuration will be delivered and at what price, and record the decision against the sample. For the next order, convert the approved configuration into a specification sheet with a revision number, and attach it to both the enquiry and the purchase order so that the two documents can no longer describe different products. Suppliers such as YCC in the Donglong zipper supply chain generally welcome this, because a written configuration protects them from the same ambiguity.

The broader lesson is that a unit price is a statement about a product, and a product only exists once it has been written down. Buying on the number alone means buying an undefined product, and an undefined product will always be delivered at the cheapest interpretation available.