George Boubouras was at his home in east Melbourne, taking in a cricket match, when his phone suddenly blew up.

It was late on July 13, about 10:45 p.m., and there was an urgency to the texts and calls that came flooding in. The euro had just crashed through parity against the dollar, a level once almost unthinkable, and everyone — clients, fund managers, traders — wanted to know what Boubouras, the head of research at K2 Asset Management, recommend they do. His response was simple: “Don’t fight the dollar right now.”