These kuji were on the extended line of the imposition on human body such as cho or yo in the earlier days, so it was considered that bearing kuji of 'myoshu hyakusho no eki' was for people living in the manor or kokugaryo an obligation as commoner peasants = free people (on the other hand, nengu and shoto were positioned on the extended line of so that was an imposition to rice field).
これらの公事はかつての庸や調などの人身に対する賦課の延長上にあり、荘園や国衙領に居住する者が「名主百姓の役」である公事を負担することが平民百姓＝自由民としての義務と考えられていた（これに対して年貢・所当は田地への賦課である租の延長上に捉えられている）。