It's been happening because foreigners love our high interest rates and our triple-A credit rating. McKibbin is among those urging the RBA to buy foreign assets with Australian dollars in order to nudge the Aussie down, although there were signs emerging this week that it might not need to bother.
Foreign buying of Australian government bonds fell to its lowest point in three years in the June quarter. The proportion held by foreigners slipped from 79 per cent to 77.5 per cent. Although the iron ore slide itself hasn't hurt the dollar, if foreigners start to believe it will, they could desert it en masse, leaving little holding it up.
Brian Redican of Macquarie Group says it could be the Aussie's ''Wile E. Coyote moment''.
''What we are referring to here is the well-known cartoon character who, when he's chasing the Road Runner, frequently runs off the edge of a cliff,'' he wrote to clients.
''Initially, at least, he doesn't fall. His legs are still running as if he is on land and he remains suspended in midair. But then he looks down and realises that there is nothing supporting him and it is only then that he succumbs to the forces of gravity and plunges towards the valley floor.''
On Thursday, the chief economist at AMP Capital, Shane Oliver, spoke of an US80¢ dollar. He said, if needed, it would fall to US60¢.