# 5% price increase on an underwear collection: no change in conversion

- Outcome: Flat / inconclusive
- Page type: Collection page (Ecommerce)
- Elements: Pricing, discounts & savings display
- Test run by: [SAXX](https://liftarchive.com/practitioners/saxx/)
- Commentary by: LiftArchive (our analysis, not theirs)
- Original source: https://www.shoplift.ai/case-studies/saxx
- Page: https://liftarchive.com/test/saxx-5pct-price-increase-one-collection/

A 5% price increase on one SAXX performance underwear collection showed no statistically significant change in conversion rate over four weeks. SAXX ran the test in-house on its US site, and it was published as a Shoplift case study. We treat it as inconclusive: no drop was detected, but that is not proof of no effect.

## Result

**no change in conversion**

- Conversion rate: no statistically significant difference between the two prices. This is a flat result.
- No figures were published for the conversion rates, sample size or revenue per visitor in each group.
- SAXX rolled the increase out in early December 2025 and reported no visible hit to conversion that month. That is a before-and-after observation, not part of the test.

## Control

One performance underwear collection at its existing prices on the US site.

## Variant

The same collection with prices 5% higher, shown on every page where those products appeared, including cart and checkout.

## Why it likely came out this way (our reading)

- A 5% rise on underwear works out to roughly a dollar or two per item, which may be too small for many shoppers to notice.
- SAXX sells on comfort technology and design, so its buyers may care less about small price moves than buyers of basic underwear.
- The test ran on a collection where SAXX sold a similar product at the same price, which gave a cleaner comparison but only covers one product line.
- A flat test can also mean the sample was too small to detect a modest drop.

## Caveats

The result is flat, and no sample size or confidence interval was shared, so a small drop in conversion can't be ruled out. The test covered one collection on the US site over four weeks in late 2025.

## How to run this test

- Hypothesis: If we raise prices 5% on one collection, then conversion rate will stay about the same because our buyers value the product enough to absorb a small increase.
- Primary metric: Revenue per visitor on the tested products
- Guardrail: Conversion rate
- Guardrail: Units per order
- Guardrail: Share of shoppers switching to cheaper products
- Who should test it: Premium brands facing cost or tariff pressure that need to know if a small increase will hurt sales. Plan for enough traffic to detect a small drop. It fits poorly if you sell commodity products where shoppers compare prices closely.

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Credit: SAXX ran this test and owns the result. Summary and commentary by LiftArchive (https://liftarchive.com/test/saxx-5pct-price-increase-one-collection/).
Usage: Free to use, quote and build on, with credit and a link: name the practitioner or organization that ran the test and link to its LiftArchive page. The results belong to the practitioners who ran and shared them; the summaries and commentary are LiftArchive's.