Ключевые слова: analysis, arrow, bankruptcy, blackboard, brent, business, chalk, chalkboard, chart, commerce, concept, crash, crisis, data, decline, decrease, design, diagram, down, economic, economy, exchange, fall, finance, fuel, gas, gasoline, graph, industry, line, market, money, negative, oil, pattern, price, profit, recession, report, revenue, sale, sign, statistic, stock, symbol, trade, trend, urials, wti,