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CASE STUDY · PRICE RESEARCH

Recurring mobile-price research across five countries

A recurring research assignment covering mobile-device prices on Back Market, Amazon and eBay, with a brief spanning five countries.

5 countriesGeographic scope
3 marketplacesResearch sources
36 variationsProduct scope in the brief

The client’s brief

The client needed recurring price information for a specified list of mobile devices. The research brief covered five countries and three marketplaces, with prices standardised to US dollars. The mobile-only scope excluded laptops, tablets and wearables.

The detail behind the comparison

A price alone did not describe the item being compared. The brief also required condition or grading, storage, colour and SIM type. These details mattered because two listings for the same phone model might describe different versions or conditions.

How the work was structured

The assignment involved ongoing online price collection and delivery of data files. The revised brief specified 36 product variations. It also supplied a condition mapping across the three marketplaces so their different labels had an agreed reference point.

One comparison rule from the brief

The client specified the following condition labels for a shared comparison category.

Client-defined condition mapping
MarketplaceListing label
Back MarketFair
AmazonAcceptable
eBayGood

This was the mapping for this assignment, rather than a general statement about marketplace grading.

What was delivered

Recurring price-data files formed part of an ongoing client relationship. By July 2026, the client had acknowledged the value of the data and the reliability of the work. The project provided a repeat source of pricing information for the client’s research.

What this project demonstrates

The work combined repeated collection with a detailed product brief. It required attention to which device variation was listed, how its condition was described and the currency used for the price.

A look inside the price-research workbook

This excerpt shows device specifications, country, marketplace, local prices and their US-dollar equivalents for the December 2024 period. Select the image to read it at full size.

Mobile-price research spreadsheet excerpt showing Samsung Galaxy S20 listings across the United Kingdom, United States, Australia, Germany and Japan, with local and US-dollar prices
Mobile-price workbook excerptRendered from the supplied Excel workbook, Sheet1, cells B1:N18. Two columns are widened for readability. Open image at full size.

Client identity and contact data are omitted from this case study.

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