Concept selected: Specialised trade
That carried out by companies in which the turnover of a single type of product, considering as such those that are included in a single class of CNAE-2009, is greater than 50 percent, and is carried out by the companies that trade in fewer than five types of product, considering that their main activity is that corresponding to the product with the greatest turnover.
Retail Trade Index Base 2005
. Methodological Manual
(enlaces al Inventario de Operaciones Estadísticas)