Ключевые слова: cash, cheap, cheapness, coins, cost of light, cost of living, costs, dark, ecology, economy, ecosustainability, ecosustainable, electricity, electricity costs, energy, energy classes, energy tariffs, environment, environmental protection, eur, expenses, fair, glass, household budget, increase, increase in costs, increases, jar, light, light bulb, light bulbs, lighting, low consumption, low consumption light bulbs, money, ordinary costs, ordinary expenses, piggy bank, reflections, saving, savings, set aside, sustainability, sustainable, tariff,