This is borne out as FHA has increased threefold in size since 2005.

FORBES: Meet The New Subprime: It Will Cost Us Billions

However Baker says given that urban areas have increased in size since the last estimate, it is probably fair to say the total area occupied by foxes has also changed.

BBC: Who, What, Why: Are urban fox numbers rising?

The limitation to how much division of labour you can get, how much specialisation, and thus how much increased production you can have to trade is the size of the market.

FORBES: In response to Ian Fletcher

With 20 million people, more than the populations of Libya, Lebanon and Jordan combined, Cairo is the largest city in Africa and the Middle East. (By contrast, the most populous city in the United States, New York City, is a bit more than 8 million.) Cairo's size has increased more than sixfold in the past 60 years.

CNN: STORY HIGHLIGHTS

But a number of influential countries argue that increased spending is not tenable and they want a real freeze in the size of the budget.

BBC: EU struggles to reach budget agreement