What happens when the 40 per cent stop paying rent? What would happen if they go back to their landlords and say "hey this is what I can afford - sorry about it"?
What happens when every second backyard or local park or piece of wasteland is filled with those little cabins that have sprung up on so many busy corners advertising that for just $60 a week you can get an extra bedroom?
In 2001 - when the Argentine economy was on the brink of collapse - not due to a runaway housing market but a fictitious over-valuing of the peso and the failure to pay back IMF loans, my salary started to get paid out in pizza and coffee vouchers. A government scheme to try to stimulate the local economy.
Given that I didn't eat pizza then and couldn't consume that much coffee I had to go back to my ageing land-lady and tell her what I could afford and offer that or I would have to leave.
She accepted the offer, acknowledging that as the neighbourhood emptied around her with people moving in with relatives or becoming homeless she'd rather have someone in the house than squatters whom she would never be able to remove.