The International Monetary Fund on Wednesday stepped up the pressure for far-reaching shifts in exchange rates, declaring that the dollar will have to depreciate “significantly” over the medium term if global economic imbalances are to be resolved in an orderly fashion.

In its clearest statement to date on this highly-charged subject, the IMF said it was essential that currencies in Asia and of oil exporters were allowed to appreciate as part of the required “realignment of exchange rates”. But it shied away from giving any specific figures as to the extent of appreciation required.