Documentation
What a saving on this site actually claims
The comparison behind the savings figure, the qualifiers that make it honest, and the comparisons it refuses to make.
Last reviewed against the product on .
The savings figure on this site is a specific, narrow claim, and this page exists so that nobody reads more into it than it says.
The claim
A saving is the difference between what you paid and the best comparable price available to you at the same time, for the same item, in the same unit, from a supplier you actually buy from.
Every one of those qualifiers is doing work. Remove any of them and the number stops being a saving and becomes a comparison between things that are not the same.
What is deliberately excluded
Cross-currency comparisons are excluded outright. So are comparisons across levels, because a wholesale price and a retail price are not alternatives to one another.
Reading the number honestly
- What it compares
- Like with like
- same item, unit, period and currency
- What it excludes
- Everything else
- including anything needing an assumed conversion
Measured from the savings surface at /app/savings.
A short list is the expected result. A long one usually means several suppliers are quoting the same item in the same unit, which is the situation the number was designed for.
Where it comes from
Each saving names the rows it was computed from, so the arithmetic can be checked rather than trusted. If a figure cannot name its inputs, it is a defect, not a rounding difference.