This was because the influence of a manor owner (called honjo, a proprietor of a manor) could not reach throughout his manor very much due to a long distance between his ordinary location and his manor in the regions other than the Kinai and the Kyushu regions.
畿内・九州以外では、荘園領主（本所）の所在地から距離的に遠かったこともあって、本所権力の作用があまり及ばなかったためである。