A price index answers a simple question: “Are we more or less expensive than the market?” To be useful, it must be clear, stable and actionable.
1. Define the reference basket
Your index must reflect genuinely strategic products. Build a basket containing references that represent your range and revenue.
2. Choose a weighting method
An unweighted index treats every product equally. An index weighted by sales or margin reflects business reality more accurately. Choose according to your priorities.
3. Segment by family or channel
A global index often hides significant gaps. Build sub-indices by category — such as accessories, premium and entry-level — or by channel, such as marketplaces and retail.
4. Define a clear benchmark
Choose a main competitor or an average market basket. For example, an index of 100 equals the average market price. Above 105, you are perceived as more expensive.
5. Track changes over time
An index is useful when it is monitored regularly. Weekly or monthly changes help you anticipate competitor movements.
Mistakes to avoid
- Including too many non-strategic products.
- Failing to weight key references.
- Changing the reference basket too often.
- Comparing poorly matched products.
A well-designed price index becomes a common language shared by pricing, marketing and management. It aligns teams around an indicator that is shared, easy to read and straightforward to manage.