Ключевые слова: background, battery, bills, business, buying, cash, ceramics, charge, concept, cost, credit, crisis, currency, debt, deposit, dollar, economy, energy, expense, expensive, finance, grey, heat, hot, increases, loss, money, object, pay, payment, pig, piggy, piggy bank, pipe, power, price, radiator, regulator, save, saving, season, tax, technology, temperature, thermal utility, warm, white, winter,