Ключевые слова: andalusia, banknote, bill, black, bulb, cash, coin, conceptual, consumption, cost, crisis, currency, ecology, economy, efficiency, electricity, energy, euro, evolution, expense, growth, illuminated, incandescent, increase, inflation, investing, lamp, light, light bulb, mlaga, no people, power, price, problem, rising, saving, social issues, spain, sustainability, value,