How long before the dollar hits $1.40 to the euro? That is the question many analysts are asking after a week when the US currency struck a new low of $1.3843 to the euro and fresh multiyear lows against a range of currencies, including sterling.

The US currency has fallen 4.5 per cent against the euro this year and 4 per cent against sterling, hitting a new 26-year nadir against the pound last week. The trade-weighted dollar index dropped to its lowest since 1992.