Consider Salim Khan, a dishwasher at a forward operating base in the volatile Iraqi province of Diyala.

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It could be a decent way for companies to build a base of less-volatile long term shareholders.

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Against that, Unionist politicians pose two arguments: that oil revenues are volatile and that the broader tax base of the UK permits greater resilience against short-term shocks such as sharp increases in unemployment and, therefore, benefits.

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