Once that currency is the euro, money managers in these countries can invest all over the single-currency region and so will need a euro standard.

ECONOMIST: Europe��s index wars

This battle is about to be re-enacted in the euro zone, where higher-cost countries have tied themselves to a new gold standard, in the form of the hyper-efficient German export machine.

ECONOMIST: The link between exchange rates and asset markets

We have had a little pre-buy effect because Euro 4, the latest emissions standard, was valid from the first of October.

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