Ключевые слова: action, background, benefit, black, black friday, blackboard, business, buy, buying, commerce, commercial, copy space, copyspace, cost price, cyber, discount, discounts, ecommerce, elimination, empty, eshop, expenses, friday, inscription, interest, internet, letters, market, marketing, monday, online, percent, percentage, price, promotion, purchase, rate, retail, sale, sell, shop, shopping, sign, space for text, store, supermarket, symbol, text, trade, wooden,