Price sensitivity analysis: Where do buyers go when the price changes?
A worked granola example follows the choices behind a lost regular-pack sale. Switching brands, buying a smaller bag and waiting call for different price responses.
Price sensitivity analysis follows what buyers change when a price changes: the brand, pack, channel, quantity or timing of their purchase. Those movements help a commercial team decide whether to keep the price, change the offer or investigate a particular group of buyers.
A decline in regular-pack sales leaves that decision open. Some shoppers may have bought your smaller pack. Others may have chosen a competitor, used what was already at home or postponed the whole category purchase. Each movement changes what the brand earns and what the next study needs to explain.
Consider Fennbank, a fictional granola brand deciding whether to raise its 500 g bag from $6 to $6.60 at one grocery chain. A 300 g bag at $4.50 will remain available. All prices, costs and calculations in this worked example are illustrative planning inputs; no customer study has been run.
The lower bill buys less granola
Fennbank's comparison concerns shoppers buying granola for breakfast at home. The recipe and the two pack sizes stay the same. The shelf includes the same competing products, and shoppers can leave without buying granola.
Fennbank offer | Shopper price and brand economics per bag |
|---|---|
Current 500 g bag | $6 shelf price; $1.20 per 100 g; $4.20 brand net receipts; $2.70 variable cost; $1.50 contribution. |
Proposed 500 g bag | $6.60 shelf price; $1.32 per 100 g; $4.62 brand net receipts; $2.70 variable cost; $1.92 contribution. |
Continuing 300 g bag | $4.50 shelf price; $1.50 per 100 g; $3.15 brand net receipts; $2 variable cost; $1.15 contribution. |
Net receipts are the brand's revenue after the retailer terms included in these assumptions. Contribution subtracts the specified variable cost from those receipts. The shelf price describes the buyer's offer; it isn't the amount the brand receives.
The smaller bag asks for $2.10 less than the proposed regular bag on this trip. It also costs more per 100 g. A shopper choosing it may be managing today's cash outlay, reducing waste or buying for fewer breakfasts. Calling that person simply “price sensitive” misses the reason the smaller offer works.
A lost sale has a destination
Start with the buyer's recent purchase occasion before showing proposed prices. Ask what they bought, where, how much and what else they considered. Then investigate the complete choice under the proposed offer.
Possible response | What it changes for Fennbank |
|---|---|
Keep the regular bag | The brand retains the purchase at the higher contribution, subject to later buying and costs. |
Choose the smaller Fennbank bag | The brand keeps this purchase, but earns less per bag and supplies less granola. Investigate the smaller bill and expected use. |
Choose another brand | Compare the actual substitute's quantity, price and benefit. The issue may be the acceptable premium over that alternative. |
Buy through another channel | Check availability, travel or delivery costs and the brand's receipts through that route. A store-level loss may remain a brand purchase. |
Buy no granola on this trip | Ask whether the shopper has stock, will buy later or will use another breakfast. Follow-up is needed to distinguish delay from leaving the category. |
The last row deserves care. A single no-purchase answer doesn't establish that someone has stopped buying granola. Even a completed transaction records one encounter. Give the next-purchase investigation enough time to cover the buying cycle relevant to the decision.
Price elasticity summarizes how quantity responds relative to a price change under defined conditions. Circana's glossary describes sales-based price sensitivity in those terms. This investigation also traces the destinations and reasons behind the response. Our price elasticity guide explains the quantity calculation and its commercial interpretation.
The contribution requirement depends on the smaller bag
Suppose the unchanged-price planning comparison contains 100 regular bags and no smaller bags. Its contribution is 100 × $1.50 = $150. This is the benchmark for the arithmetic, rather than an assumption that every shopper would buy without the increase.
If the proposed offer sells only regular bags, it needs at least 79 to reach that contribution: $150 ÷ $1.92 = 78.125, rounded upward. Selling 79 would contribute $151.68.
Now allow purchases of the smaller bag. If 20 smaller bags sell, they contribute $23. The regular bag must cover the remaining $127, requiring at least 67 regular bags because $127 ÷ $1.92 is about 66.15.
Planning comparison | Contribution under the stated inputs |
|---|---|
Unchanged price: 100 regular bags | 100 × $1.50 = $150. |
Higher price: 79 regular bags | 79 × $1.92 = $151.68. |
Higher price: 67 regular and 20 smaller bags | 67 × $1.92 + 20 × $1.15 = $151.64. |
The final combination sells 87 bags containing 39.5 kg, compared with 50 kg in the unchanged-price comparison. Bag counts, product quantity and contribution give three different readings. Retaining a smaller-pack purchase can matter financially even as the amount of granola sold falls.
These requirements don't predict how shoppers will respond. They tell the team which buying patterns could support the price under the specified costs. Additional promotion spending, waste or retailer funding would change the calculation.
The relevant audience is larger than today's loyal buyers
Existing Fennbank buyers can explain their routine and alternatives. Category shoppers who currently buy another brand matter too, because a higher price may change acquisition. Plan those views separately when both could change the decision.
Income alone doesn't identify the response. Ask about the buying occasion, household use, available substitutes and the purchase being considered. A shopper who can afford the regular bag may prefer a smaller quantity; another may want the larger bag but lack the cash for it today.
Keep recruitment and eligibility visible. A survey sent only to loyal customers doesn't describe every shopper reaching the shelf. AAPOR's survey guidance recommends matching the sample to the intended population and considering whether other records are needed alongside survey answers.
The readout should preserve choices and buying behavior
For the stated-choice comparison, independently assign eligible shoppers to the current or proposed shelf. Each sees one regular-bag price first. Keep pack quantities, competing offers and presentation consistent. Ask what they would choose, including no purchase, then investigate their explanation without suggesting one.
Return one row for each price condition, prespecified buyer group and choice. Each row needs the answering base, choice count, share, grams represented by that choice and contribution assumption. Show all destinations, including unknown or uncoded answers. Reasons should remain connected to the choice they explain.
Sapien can explore those responses with a defined simulated audience and help investigate why a smaller bag, rival or different breakfast becomes attractive. Supply the complete shelf and relevant buyer evidence so the comparison concerns the purchase Fennbank can actually offer.
Paid behavior belongs in the subsequent commercial comparison. Retain the unchanged-price reference, observe availability and follow eligible shopping opportunities through the agreed window. Report contribution on a common base alongside pack mix, quantity, refunds or waste and later purchases. A stated choice remains separate from a transaction.
The response should fit the movement
If shoppers understand the regular bag but choose the smaller one for a lower bill, the next question concerns an affordable entry offer. If they switch to an equivalent rival, investigate the premium and the benefit supporting it. If they postpone buying because they already have stock, a broad price cut may address the wrong problem.
Use those distinctions to choose the next comparison. Our pricing and offer research services can help scope the regular price, smaller offer and buyer groups worth investigating. The useful recommendation names where purchases may move and what that movement would have to earn before the brand changes the shelf.
