Each category, manufacturer or brand price change is calculated looking at the price chage of the individual SKU to ensure the most accurate analysis.

If for example a brand overall is seeing greater price change than the individual categories this is likely to be driven by a more premium category seeing a greater price change than less premium category. An example of this maybe where the price change on a Persil Capsule is greater than the price change on Persil Washing Up Liquid. As a result the overall brand will have seen a greater price change (as the price change has happened on more premium products).