But after the middle of the eighteenth century, as commercial distribution became increasingly important, the disparity between the market rate of transportation and the official rate widened.
ところが、18世紀中期以後、商品流通が盛んになる一方で、民間の輸送相場である相対賃銭（あいたいちんせん）と御定賃銭の格差が広がった。