Ключевые слова: america, background, bank, banknote, bill, bulb, cash, change, coin, concept, conservation, cost, credit, currency, dollar, economic, economy, efficiency, electric, electricity, energy, exchange, expensive, filament, finance, financial, flag, foreign, government, idea, investment, lamp, life, light, loan, money, object, power, rate, red, rich, stack, star, stripe, symbol, technology, tungsten, usa, value, white,