The BDI, short for Brand Development Index, is a key indicator used to assess the consumption of a specific brand in a given region by comparing its market share to the local demographic distribution. For example, if a brand holds a 5% market share in region A, where 20% of the country’s total population lives, the BDI would be 25. This simple calculation helps identify the areas where the brand’s main consumers are concentrated. It is particularly useful for planning advertising campaigns to effectively target audiences. By refining the BDI calculation to population segments that more closely match the target customer base, marketing professionals can optimize their communication strategies.