Ключевые слова: 20, 80, analysis, background, business, color, compare, concept, conceptual, design, drawn, economic, education, efficiency, effort, eighty, factor, few, graph, inequality, law, majority, management, market, metaphor, minority, nobody, numbers, paper, pareto, percentage, percents, presentation, principle, productivity, profit, proportion, quality, representation, result, rule, sparsity, success, twenty, vital, white,