Again, the rationale was that a majority of customers would accept one or the other price plans, a few may accept both services, and some would leave.

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"It should be remembered that the price a vehicle is advertised for sale as is not the same price that someone might pay - second-hand car dealers may overstate the price in a newspaper or trade magazine, but accept much less when negotiating, " the spokesman added.

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Alternatively, stronger correlation may reflect a change in the willingness of investors in different countries to accept price volatility: if investors are more risk averse, they will insist on a higher return for the risks they bear by holding shares, so share prices would have to fall.

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