Price gap analysis: your brand against the category

How far above the category average can your price sit before it starts costing you volume? Price gap analysis is how brand teams approach that question. It compares your unit price with a reference, such as the category average or a key competitor, and tracks how that difference moves over time alongside your sales.

The gap itself isn't good or bad. Premium brands live with a large one on purpose. What matters is whether the gap is changing, and whether volume is responding.

How do you calculate a price gap?

Use unit prices, not shelf prices. Convert everything to price per ounce, per count or whatever standard fits the category, so pack sizes don't distort the comparison.

Then express the gap as an index. Divide your unit price by the reference unit price and multiply by 100. An index of 100 means parity. Above 100, you're more expensive. Below, you're cheaper.

A hypothetical: your 20-ounce bottle averages $2.29 across the stores you're analyzing, and the category's average for comparable 20-ounce bottles is $2.09. Your price index is about 110. If a key competitor averages $2.19, your index against that competitor is about 105.

Track it by month or by period, using the same stores each time so store mix doesn't move the number.

Which comparison should you use?

Pick the one that matches the shopper's actual choice. If your product sits next to two main rivals on most shelves, those rivals are the right reference. If shoppers shop across a whole subcategory, the subcategory average fits better.

Value brands can also be a useful reference where they're stocked, since they often set the floor of the price ladder. Where a store doesn't carry one, the lowest-priced national brand plays a similar role.

Be consistent. Switching reference points from one review to the next makes the trend meaningless. It's fine to track two or three references, as long as each is tracked the same way over time.

Independent retailers set their own prices, so gaps can vary a lot from store to store. Looking at the spread, and not only the average, shows whether a problem is widespread or concentrated in a few locations.

What does a widening gap tell you?

On its own, not much. Combined with volume, quite a bit.

If your gap widens and your volume holds steady, shoppers are accepting the higher relative price, at least for now. If the gap widens and volume falls while the reference holds, the gap may be doing damage. The economic idea here is price elasticity of demand, how strongly volume responds to price.

Watch for causes you didn't choose. A competitor's temporary promotion narrows its price and widens your gap for a few weeks. That's different from a lasting shift, and it calls for a different response.

It also helps to separate regular and promoted prices. A gap calculated on average selling price mixes your promotion calendar with your everyday pricing. A gap calculated on regular price, with promoted weeks set aside, shows your everyday position more clearly. Both are useful, and they answer different questions.

What would you do with this on Monday?

Choose your reference set and calculate a price index for each of the past twelve months, on a unit-price basis, in a constant group of stores. Plot it next to your volume.

Then set review thresholds. For example, flag any month where the index moves more than a set number of points and volume moves the opposite way. Those are the months worth a conversation with your pricing team or distributor.

Keep the output simple: one chart per reference, with the index and volume side by side across twelve months. More detail belongs in an appendix. Unit price basics are worth sharing with anyone new to the analysis. For category-wide context, NRS Insights publishes monthly reporting.