Side by side on the store shelf. Two very similar cartons - one containing "mosskiller soluble", the other "complete soluble" - the latter promising lawn greening in addition to the weed and moss killing promised by the former.
Closer inspection reveals these identically priced products to 1) be from the same company, 2) contain exactly the same ingredients and quantities and 3) have packaging adorned with identical instructions and claims.
Aren't product extensions meant to be different? Perhaps not? Perhaps they just fill shelves to the exclusion of the competition?