我国古代的经济重心,最早在北方的黄河流域。南方经济曾经在相当长的时间内,远远落后于北方。在西汉初期的文献中,有大量关于南方农业采用刀耕火种,生产力水平极低的记载。如《淮南子主术训》有“(南方)夫民为生也,一人跖耒而耕。”《盐铁论》有“(南方)百姓木耕手薅,衣食不足? The ancient Chinese economic center of gravity, the earliest in the north of the Yellow River basin. For a long time, the southern economy lagged far behind the north. In the early Western Han literature, there was a great deal of record about the use of slash-and-burn farming in southern agriculture and very low productivity levels. Such as “Huainan sub-main technique training,” there are “(Southern) couple living, one tingling and farming.” “Salt and Iron” There are "(Southern) people wood hand, inadequate food and clothing?