Until then, breweries had basically taken advantage of the difference between shuzokabu amount and the amount of rice for brewing sake to deal with any policies made by the bakufu, such as by overstating the required value in advance, so that their business would not suffer a loss, but "the merchants' magic" they had used could not work on the obligatory supply of the one-tenth amount of rice for sake brewing.
これまで酒屋たちは基本的に、幕府からどのような政策が下っても自分の商売に実質的な損をきたさないように、酒造株高と酒造米高の格差をうまく利用し、あらかじめ求められた数値を水増し申告しておくなどして対処してきたが、この十分の一役米に対しては今までの「商人マジック」が使えなかった。