Ключевые слова: abstraction, account, background, background earn, banknotes, benefit, benefitting, benjamin franklin, bill, book, budget, business, cash, college, computer, copy, cover, currency, diary, dollar, dollars, education, empty, finance, financial, flat layout, information, knowledge, laptop, loan, metaphor, mockup, money, mony, note, office, online, plain, space, text, texture, top, trade, training, usd, value, view, white, wooden,