The euro was close to a three-month high as the US dollar on expectations of more monetary stimulus from the US and a strengthening recovery elsewhere that pushed up more volatile currencies.One of the currencies to monitor was the New Zealand dollar, which was on course to reach its highest since June 2018.Investors are short dollars as enthusiasm over potential vaccine trials drives buying of volatile currencies and higher-yielding assets outside the US.Concerns over increasing coronavirus cases have not provided the dollar with much support, as speculation grows that the Federal Reserve will act to support the economy through a harsh winter before vaccinations become available.