An independent Scotland could become the richest country on earth. I’m not joking. It has all the necessary ingredients. Let me explain.

Each year the World Bank, the IMF and the CIA each independently publish a list of the richest countries in the world - as measured by GDP per capita at purchasing power parity.

The UK sits at a rather disappointing 21st, but topping those rankings you have the likes of Qatar, Luxembourg, Singapore, Brunei, Norway and Switzerland.

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