It was the first form of the family to be based, not on natural, but on economic conditions -- on the victory of private property over primitive, natural communal property.

• 一夫一妻制是不以自然条件为基础，而以经济条件为基础，即以私有制对原始的自然长成的公有制的胜利为基础的第一个家庭形式。