.... only nzd performed better against the us-dollar since the start of 2012 in the G10-world. After such move probably market participants are well positioned in this currency pair and waiting for further up move.
Also stop losses might adjusted higher to protect profits. It seems that the risk for a correction is increasing depending if up side momentum is collapsing. Kindly compare the latest up move with the positioning at the CFTC in AUDUSD. Last time the positioning reached such level a correction of more than 5 big figures followed.
Carefully monitor any aud-long position.

