[shaggy eel]

,,, the thought of an "ANZAC" dollar has been talked over again within the last year, without any outcome or resolution. I don't personally see any point in shifting to such a unit or taking on the $AU. It simply makes us [in currency terms] users of a slightly bigger fish in the pond. A shift to $US would be a smarter move. Once again, ACT sees merits in this.

[NativeNewYorker]

Advantage to $ANZAC/Aussie currency would be liquidity and a general lowering of transaction costs/risk premia.

Disadvantage would be akin to that of the Euro, with forcing two economies into one currency pigeonhole. In your case, as your economies are so closely intertwined and have (at this great distance) similar political cultures, that wouldn't be much of an obstacle.

There'd also be the issue of deciding who/how to manage the new beastie, and that row would likely scupper any merger.

Adopting the $US would be a blunder, as your economies are not all that tightly tied to America's, and you'd run into a problems parallel to Argentina, tho nowhere near as severe.