A supplier raises the price of olive oil by 0.30 euros per litre on a delivery note. No warning, no email, no tariff update. They simply change the number on the delivery note line and trust that nobody will check. The next month, they do it again. And the month after that. In six months, that olive oil costs 18% more than agreed. Multiplied by dozens of items and several suppliers, the margin erosion is brutal. This is what the industry calls silent price increases, and they affect virtually every HORECA group that lacks an automated delivery note control system.
The silent price increase phenomenon
Silent price increases are increments that suppliers apply directly on delivery notes without prior communication or formal tariff updates. Sometimes it is a few cents per kilogram. Other times, the mechanism is more subtle: a change in unit of measure (from kg to unit), a brand substitution for a more expensive one, or a weight adjustment (from net weight to gross weight). The result is always the same: the HORECA group pays more without knowing it.
These practices are not necessarily malicious. In many cases, the supplier passes on increases from their own costs gradually to avoid an uncomfortable negotiation. In others, they take advantage of the client's lack of control. But the intention matters less than the effect: a constant and cumulative erosion of gross margin that goes unnoticed for months.
Why nobody detects them
The answer is simple: nobody compares every line of every delivery note with the previous price. A HORECA group with 15 locations receiving goods from 20 different suppliers can manage between 200 and 400 delivery notes per month. Each delivery note contains 5 to 30 product lines. We are talking about thousands of price lines that someone should manually verify.
Location managers, who are usually the ones receiving goods, are focused on service operations. They check the order is complete, sign the delivery note, and file it. Checking whether salmon has gone up 0.15 euros compared to the previous delivery is not on their priority list, nor should it be.
The finance department, for its part, works with totals. They see that a supplier's monthly invoice has gone up 4%, but cannot determine whether that increase is due to higher purchase volume, a communicated price increase, or dozens of unauthorized micro-increments spread across hundreds of items. Without a line-by-line breakdown with price history, the information simply does not exist.
The scale of the problem
With 15 to 20 active suppliers and hundreds of SKUs, an undetected price drift of 3% to 5% on total purchases is common in chains without an automated control system. It is a percentage that does not trigger alarms in a monthly report because it dilutes among normal volume and seasonality variations. But its cumulative impact is devastating.
Real examples that repeat themselves
These are patterns frequently observed in organized restaurant groups:
The olive oil that rises without warning. An extra virgin olive oil supplier increases the price by 0.30 euros/L on each delivery over four consecutive months. The agreed price was 5.40 euros/L; four months later, the delivery note shows 6.60 euros/L. For a group consuming 800 litres per month, that is 960 euros in monthly overspend. Nobody detects it because the manager does not remember the previous price and the accountant sees a gradual increase they attribute to the market.
The salmon that changes weight. A fish supplier starts invoicing salmon by gross weight instead of net weight. The difference is 8-12% due to ice and trim waste. The price per kilo does not change, but the effective cost per kilo of usable product rises more than 10%. It is a real increase disguised as an administrative change that no location manager will question.
The brand substitution. A supplier replaces a crushed tomato item with another "equivalent" brand at a 15% higher price. They justify the substitution by claiming stockout of the original product, but the change continues indefinitely. The kitchen notices no difference in the product, operations are unaffected, and the overspend is absorbed without discussion.
How Controliza detects silent price increases
Controliza's Trazoon module is specifically designed to solve this blind spot. Every time a location receives a delivery, the delivery note is automatically digitized via optical character recognition. The system extracts the unit price, quantity, unit of measure, and item reference for each delivery note line. But digitization is only the first step.
Automatic comparison with price history
Controliza compares each delivery note line with the price recorded in previous deliveries from the same supplier for the same item. If the price has varied beyond the configured threshold, the system generates an immediate alert to the Purchasing manager. No need to wait for the monthly close or review invoices: the deviation is detected at the moment of receipt.
Price evolution tracking by supplier
The system records the price evolution of each item over time, supplier by supplier. This makes it possible to visualize trends that would otherwise be invisible: a supplier raising prices 1% every month does not raise suspicion on any individual delivery note, but on the six-month evolution chart the trend is obvious. That visibility turns a suspicion into an objective data point.
Detection of unit changes and substitutions
The system automatically identifies when an item changes unit of measure (kg to unit, litre to container) or when it is replaced by a different item with a different price. These changes, which in a manual process go completely unnoticed, are recorded and flagged for review.
From detection to negotiation
Detecting the price increase is only half the value. The other half is what the purchasing team can do with that information. When a purchasing director sits down with a supplier and shows them a chart with the price evolution over the last six months, item by item, with exact dates of each uncommunicated increase, the negotiation dynamic changes completely.
It is no longer a conversation based on perceptions or invoice totals. It is a negotiation backed by granular, irrefutable data. The supplier cannot argue that prices have not changed when they have the line-by-line history in front of them. And the purchasing team can precisely quantify the accumulated overspend to demand a retroactive correction or a tariff revision.
Additionally, the integration with the Forecast module allows the purchasing team to anticipate volume needs and negotiate from a stronger position: if I know I will need 1,200 kg of salmon next quarter, I can lock in a fixed price with a volume commitment that protects the group against future increases.
Measurable impact
HORECA groups that have implemented Controliza for automated delivery note control and supplier price management report consistent results in the first months of use:
Data measured in active Controliza clients.
In chains with more than 20 locations and purchasing volumes exceeding 1.5M euros annually, detecting and correcting silent price increases can represent annual savings of between 30,000 and 75,000 euros, from this alone. Savings that were there, hidden in thousands of delivery note lines that nobody had time to review.
Do you know if your suppliers are raising prices without telling you?
With Controliza's Trazoon module, every delivery note is automatically verified against the price history. Discover how the Purchasing module turns that data into real negotiation power. Request a personalized demo and check it with your own delivery notes.
