Turmoil in the Middle East has sent investors scrambling for safety once more, reigniting a debate over which assets truly offer protection in times of stress. The choice is complicated, as traditional refuges behave unpredictably. Gold has swung sharply, and the dollar — which has been out of favour in the past year — has bounced back. Here’s a look at how some of the favourites stack up: Greenback passes a test The dollar has arguably performed the best among safe havens this week. The dollar index, which tracks the US currency against six others, is up 1.5 per cent. The dollar has even gained against the Swiss franc and yen, which both typically outperform at times of market stress. That’s particularly notable as the dollar weakened when stocks fell following last April’s tariff turmoil, raising questions about its safe haven status. It’s short-term dollar cash that’s in demand, not other dollar assets, flow data shows. Of course, the US is a net energy exporter, so a crisis like this that sends benchmark ...