An undersatnding of how the currency market works will tell you that money moves around the globe looking for a fast and high return like sheep looking for long grass. Just like the Aus dollar was at unrealistic levels about four years ago, ie US$0.47, it now is getting to unrealistic levels at US$0.90. Political changes in Australia and the US over the next 12-18 months will bring the US$ back to a more realistic level.