Short answer: undercutting is pricing the same product just below a competitor to win the sale. When a competitor undercuts you, first check whether it is a real, lasting price or a short promotion. Then decide on margin, not on reflex: often holding your price, bundling, or improving shipping beats matching. Matching every cut is how a price war starts.
What is undercutting?
Undercutting means setting your price below a competitor’s for the same or a comparable product, usually by a small amount — a dollar, a few percent — so you show up as the cheaper option in search, on a marketplace, or in a comparison tab. On marketplaces it is often automated: repricing tools undercut the lowest offer by a fixed amount.
Why competitors undercut
- They want the marketplace buy box or the top spot in a price-sorted list.
- They are clearing stock: an old model, leftover sizes, a product being discontinued.
- They have lower costs: a better supplier price, cheaper shipping, or no ad spend.
- A repricing rule did it, and nobody looked.
- They are buying market share and are willing to lose money for a while.
Is it a real undercut or a temporary promotion?
One lower price tells you little. What matters is how long it lasts and how often it happens. Look at the price history of that competitor’s page:
- A weekend dip that comes back: a promotion. Answer with a time-boxed offer, or not at all.
- A step down that stays: a new price. Now you have a real decision.
- Small cuts every few days: probably an automated repricer. Matching it by hand is a losing game.
- Several competitors cut at once: the market price moved, often because a new model arrived. The product may be ending, not on sale.
You need a record for this. Checking the page daily and keeping the numbers — by hand or with a tool like PriceSense, which keeps 30 days of history on Premium and six months on Pro — turns a guess into a pattern.
How to respond to undercutting without matching
- Hold. If you are a few percent higher and offer better service, faster delivery, or better photos and reviews, many buyers will still pay.
- Bundle. Add an accessory or a second item. A bundle has no direct price to compare, and you keep more margin than a straight cut.
- Compete on shipping. Free or faster shipping on that product can close a small gap. See free shipping strategy.
- Pause the ads on that product. Paying for clicks you will lose to a cheaper tab is the most expensive response of all.
- Move budget to products where you are competitive, and let this one sell slower for a while.
When matching the price is the right call
- The new price is lasting, not a promotion.
- You still make an acceptable margin at that price.
- The product drives traffic or repeat buyers that make up the difference elsewhere.
- Shoppers really do compare it side by side, because it is identical everywhere.
If you match, match the price — do not undercut back by another dollar. That is the move that turns a price change into a price war.
How price wars start
A price war is a cycle of competitors cutting in response to each other until nobody earns a margin on the product. It usually starts small: one seller undercuts, another matches and goes one lower, repricing rules pick it up, and within weeks the price sits near cost. The shoppers win for a while. The sellers, especially the small ones, do not.
How a small shop avoids a price war
- Know your floor for every product you watch: the lowest price that still pays for itself.
- Never undercut back automatically. Decide each change yourself.
- Compete on the things big sellers do badly: advice, curation, service, speed.
- Keep a list of which competitors move often, and stop reacting to them.
- Let go of products that have become commodities, and put the effort where you are different.
And when every competitor raises prices, you can follow. See raising prices without losing customers.
Is undercutting legal?
Setting a lower price than a competitor is normal competition and generally legal. Predatory pricing — deliberately selling below cost to push competitors out, then raising prices — can break competition law, but cases usually involve companies with a dominant market position, not small shops. Agreeing prices with competitors is the thing to avoid. Rules differ by country; this is not legal advice.
Seeing undercuts before they cost you
Most small shops find out about an undercut from falling sales, days late. PriceSense checks the competitor product pages you add — daily on paid plans, weekly on Free — and alerts you when the price changes. On Pro you can set a competitor to alert only on drops, or only on moves above a percent or amount, so you hear about undercuts and not every small change. It does not reprice your store; you decide. More on the method in competitor price monitoring, or compare price monitoring tools.
Watch a competitor page yourself
Free covers one product and three sellers. Email and app alerts when the price changes.
Questions we get
What does undercut mean in business?
To undercut is to offer the same or a similar product at a lower price than a competitor, usually by a small margin, to win the customer.
Should I always match a competitor's lower price?
No. Match only when the new price is lasting, you still make an acceptable margin, and shoppers compare the product side by side. Otherwise hold, bundle, improve shipping, or pause ads on that product.
Who wins a price war?
Usually the shoppers in the short term and the seller with the lowest costs in the long term. Small shops rarely win on price alone, so they do better competing on service, curation, and speed.
How do I know when a competitor undercuts me?
Check the competitor's product pages on a schedule and keep the history. A price monitoring tool can check daily and alert you only when a competitor's price drops.