The first one is the Engels coefficient, which explains that the cost of daily necessities has dropped its percentage all through the past decade, in terms of family income, to about 37-some percent.
اولی ضریب انگلس است، که توضیح می ده درصد هزینه مایحتاج روزانه از لحاظ درآمد خانواده، در طی ده سال گذشته، کاهش یافته و به حدود 37 درصد رسیده.