Ключевые слова: accounting, background, bank, blue, budget, bulbs, business, coins, concept, conservation, consumption, control, cost, economical, economy, efficiency, electric, electrical, electricity, energy, expense, expensive, finance, financial, illumination, invention, investment, light, lightbulb, money, object, pay, piggy, piggybank, pink, plug, power, price, profit, save, saving, savings, symbol, tariff, tax, technology, wealth,