Because every day, they have to use the bracelet to access transportation and cross zones. Those accesses would be tracked. What are the authorities going to think when a supposed single person enters the subway seven times, a few minutes apart each time, and then leaves the subway having gone to seven different places? Is working seven different jobs, at ...
Because film had two names ;
What Happened to Monday in USA , Germany
Seven Sisters in Canada, France, Italy and Slovakia)
From Also known as section of of IMDb:
(original title): Seven Sisters
Brazil: Onde Está Segunda?
Canada (alternative title) (English title): 7 Sisters
Germany: What Happened to Monday?
Greece: Τι συνέβη στη Δευτέρα
It does seem a logic plot hole in the movie even if we explore all the possibilities:
They stocked up - Even if we consider that they stocked up their food supplies by cutting intake and stretch their rations it's not possible to feed all 7 of them for the long time.
They get food from the black market - This can also be a logical possibly since food is so ...