Are retailers ripping off southerners?

Sarah Coles
McDonald's burger
McDonald's burger

MICHAL KAMARYT/Czech News Agency/Press Association Images

Retailers from supermarkets to restaurants and cinemas stand accused today of operating a 'price apartheid', ramping prices up in the South and cutting them in the North, so that Southerners pay more for everything.

So what's going on, and can this be fair?