 However, it is not practicable to introduce it in one step for political reasons and so the preferred method of introduction is for countries to gradually move their currencies closer or in some cases to adopt another country's currency as a series of steps inching closer to the SEMU.Examples could include countries that have already adopted the US dollar as their currency or Australia and New Zealand joining forces or Pacific Islands adopting a larger country's currency.Ideally, the SEMU would coincide with trade barriers being removed and international laws moving into alignment.