《寡人之于国也》中孟子在向梁惠王阐述“王道之成”时,说了这样一段话:“五亩之宅,树之以桑,五十者可以衣帛矣,鸡豚狗彘之畜,无失其时,七十者可以食肉矣,谨庠序之教,申之以孝悌之义,颁白者不负戴于道路矣。”孟子生活在战国时代,当时生产力低下,战争频繁,人民的生活水平低下,农耕社会,科技欠发达,商品交流不通畅, In the case of Liang Hui-king, “Men of Guinness and Guowei” also said the following passage: “Five mu of house, the tree of mulberry, fifty can be clothing, The chickens, dogs and cats, without exception, the seventy who can be meat carry on, orderly teach, apply the filial righteousness, the confession were to wear the road carry on. ”Mencius lived in the Warring States Period, At that time, the productive forces were low, the war was frequent, the people’s living standards were low, the society of farming, the underdeveloped science and technology, the unfriendly exchange of goods,