When the Enkyu senjimasu (the nation-wide official measure in the Enkyu era) established by the Imperial Court fell out of use as the political power of the court noble government declined, masu began to be manufactured by a variety of different standards around the country, and the negative effects of this situation worsened in the Muromachi period.
公家政権の政治力に低下に伴い、朝廷が定めた延久宣旨枡が用いられなくなると、日本各地でまちまちな基準で枡が作られるようになり、室町時代にはその弊害が深刻化した。