By Liam Byrne, MP for Birmingham, Hodge Hill and former Chief Secretary to the Treasury As Amazon founder Jeff Bezos and the rest of the super-rich gathered at the World Economic Forum in Davos last week, Oxfam revealed that despite the economic slowdown, the world’s richest are getting richer. No wonder sales of super-yachts, Rolls-Royces and private jets are at an all-time high. The average price of a house on Britain’s most expensive street has soared to a mind-blowing £23million – but you could buy several streets in my constituency for that. If we don’t change things pronto, this inequali…