Mistine is a direct selling cosmetics firm based in thailand. originally, it made a name for itself selling an affordable product that was of good quality. it focused mainly on housewives. however, over the years mistine has expanded its focus, targeting more groups such as teenagers and higher-income women. unlike many comparable direct selling firms, mistine engages in much advertising. its advertising campaigns must be tailored toward the appropriate target market. suppose a sales manager at mistine wants to determine the company's market potential. she first estimates how many cosmetic products potential buyers will purchase in her sales territory during a given period. she multiples that amount by the total number of potential in that area and then performs the same calculations in the other territories in which mistine operates. she then adds together the totals to get the company's market potential. what type of approach is the sales manager using?