This is where the theory collides unpleasantly with the real world. The "minimum needed to survive" will be ratcheted up by every politician courting votes, and the people will happily play along.

F'rinstance I don't begrudge anyone a roof over their heads, but right now in the UK it is causing an enormous political storm trying to roll back "... with a spare bedroom or two, in the postcode of your choosing" getting tacked onto this basic right somewhere along the line.