Most important is usually the 'rate' of usage, to which the Pareto 80-20 Rule applies. Kotler's 'heavy users' are likely to be disproportionately important to the brand (typically, 20 percent of users accounting for 80 percent of usage — and of suppliers' profit). As a result, suppliers often segment their customers into 'heavy', 'medium' and 'light' users; as far as they can, they target 'heavy users'. However, research shows that heavy users of a brand are not always the most profitable for a company.