Traditionally, the purchasing department, especially in the larger companies, would purchase materials from a large number of different suppliers, in order to be able to diversify away the negative effects of poor quality by any one supplier. Moreover, if one supplier is unable to meet delivery schedules, or even goes out of business, this would have only a small effect on the purchasing company.
Jadi, ununuzi wa idara, hasa katika makampuni makubwa, bila kununua vifaa kutoka idadi kubwa ya wauzaji tofauti, ili kuwa na uwezo wa vyanzo mbalimbali mbali na madhara hasi ya ubora duni na yoyote muuzaji mmoja. Aidha, kama muuzaji mmoja ni kushindwa kukidhi utoaji wa ratiba, au hata huenda nje ya biashara, hii ingekuwa tu athari ndogo juu ya kampuni ya kununua.