The costliest mistakes are the ones nobody notices
When people talk about "purchasing mistakes," they almost always picture obvious episodes: a forgotten order, a wrong delivery, a supplier who doesn't show up. Those are real problems, but they're also the easiest to spot — and precisely because of that, they tend to get fixed quickly.
The biggest costs hide elsewhere: in a series of small discrepancies that, taken one by one, seem insignificant, and that nobody checks because checking would mean comparing every invoice against the original order, line by line, every week. Here are the five most common.
1. Always ordering from the same supplier without comparing prices
Most restaurants have a "trusted" supplier for each product category, and order there out of habit more than verified convenience. The trusted supplier isn't necessarily the expensive one — but without a periodic comparison, you don't actually know that either.
The right way to check isn't switching suppliers every month, but periodically sending a price request to the same 2-3 suppliers for the main categories, and comparing the offers line by line before confirming the order. Even if you end up confirming with the same supplier as always, now you're doing it knowing they're still the best value — not out of inertia.
2. Ordering quantities the supplier can't deliver exactly
Many products aren't sold as single units but by pack: a case of 24 bottles, a box of 12 packs, a keg of a certain capacity. If you order "80 pieces" of a product the supplier only sells by the case of 24, the supplier rounds on their own — usually up, to the nearest full case — and the quantity that actually arrives never matches what was requested.
The problem isn't the single delivery: it's that if the received quantity is never compared with the ordered quantity, stock silently starts drifting from the system with every order, a little at a time. Knowing each product's pack size in advance — units per case, minimum order quantity — lets you order multiples of that pack from the start, instead of discovering the rounding after delivery.
3. Not noticing a price creeping up gradually
A sudden, large increase gets noticed right away. A small increase, repeated invoice after invoice — 2% this month, 1.5% next — almost never does. Yet the compound effect of small, unnoticed increases weighs as much as a sudden one, just more slowly.
Example: an ingredient costing €10/kg that rises on average 1.5% every quarter, unnoticed, ends up costing about €10.61/kg after a year — a 6.1% increase that, on an annual consumption of 200kg, adds up to €122 spent without a single invoice ever triggering an alarm. Across dozens of different ingredients, the effect multiplies.
The only way to catch it is to compare every incoming price against the product's full history, not just against the last invoice's price — a 2% increase from last month could be the fifth consecutive increase of the same size.
4. Paying the same invoice twice
This happens more often than people think, especially with suppliers who send both a paper and a digital copy, or when the person handling bookkeeping changes: the same invoice, same number, same supplier, gets recorded and paid twice in the same calendar year. Without an automatic check on invoice number and supplier, the error only surfaces at year-end during accounting review — when it's much harder to get reimbursed.
5. Extending immediate trust to a new supplier on a large order
A new supplier, with no invoice history, issuing an invoice above a certain threshold (€500 is a reasonable reference), deserves an extra check before being paid automatically like the rest: this is exactly the moment when a typo on the total, a misunderstanding on agreed prices, or — in the worst cases — an attempted fraud, more easily goes unnoticed, simply because there's no history yet to compare against.
The common thread: none of these mistakes show up without comparison
Every bad habit on this list has the same underlying cause: a missing systematic comparison — between suppliers, between order and delivery, between invoice and price history, between different invoices from the same supplier. Taken one at a time, each check takes a few minutes. Doing it for every order, every week, by hand, is what almost no restaurant owner actually has time for — which is exactly why these mistakes survive year after year even in well-run kitchens.
How BiteBase catches these mistakes
Supplier comparison happens before ordering: you send a price request to multiple suppliers at once, and the offers come back aligned line by line for a direct comparison, instead of having to open different emails and rebuild the comparison by hand.
On products ordered by pack, BiteBase records the minimum order quantity and pack multiple, and applies them when proposing or generating an order — so the proposed quantity is already an orderable multiple, not a number the supplier will have to round anyway.
On invoices, every price is compared against the last recorded purchase price for the same product: a deviation over 10% generates a warning, which becomes more severe past 25% — so an increase never goes entirely unnoticed, even when it's small compared to the last invoice but significant compared to the full history. An invoice with the same number and supplier already recorded in the same calendar year generates a possible-duplicate warning, and a new supplier with an amount above threshold gets flagged for an extra check before being treated as a routine one.
Frequently asked questions
Does it make sense to request quotes from multiple suppliers for every single order? No, that's neither practical nor necessary. It makes sense periodically (every month or quarter, depending on volume) on the heaviest spend categories, to verify the usual supplier is still competitive — not for every weekly delivery.
How do I know the right pack size for a product if the supplier doesn't state it clearly? Check the last invoice or the supplier's catalog: the sales format (case of X, box of Y) is almost always stated, even if in a hard-to-read format. If it's unclear, asking the supplier directly avoids surprises on the first order.
Should a price deviation always be disputed with the supplier? Not necessarily — sometimes it's a legitimate market increase (seasonality, energy costs, raw materials). But it should always be verified before being accepted silently: the difference between "I knew and accepted it" and "I didn't notice" is the whole difference for cost control.