That can have numerous causes. I tend to believe that the dollar strength were currently experiencing is flight to safety. Dollar strength can and does drive down the price of gold in dollars.
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Its more than a flight to safety.
The US fracking revolution is printing many more real dollars than the fed is printing fiat dollars.
The fracking boom led to the dollar strength earlier in the year, we’re in the midst of the longest dollar rally since... 1967. The more recent dollar spike leading to the precipitous drop in PM’s is flight to safety, imho.