> In San Francisco, high rents have driven the government's "low income" threshold of $117,400 (£87,970) almost as high as the median income for a family of fou

> In San Francisco, high rents have driven the government's "low income" threshold of $117,400 (£87,970) almost as high as the median income for a family of four in the area - $118,400 (£88,630). You know something has gone haywire when "low income" and "median" incomes are basically the same amount.