Ключевые слова: advertisement, auction, backdrop, background, bid, block, brick, business, buy, c2c, citizen, client, commerce, commission, communication, company, concept, consumer, contract, cube, customer, deal, electronic, individual, information, interact, interaction, market, marketing, network, offer, online, partner, plan, product, promotion, purchase, relationship, sale, sell, service, shopping, square, strategy, technology, transaction, wood, word, yellow,