This five-year look at daily change in the dollar index includes the massive fiscal and monetary response to covid lockdowns. And it includes the very contentious U.S./China trade war.
So what could trigger a bigger dollar decline on Friday, than all of the events mentioned above?
Was it anticipation of gridlock in U.S. Congress and therefore an end to the excessive fiscal spending, which softens the inflation and rate outlook?
Was it the Friday's jobs report, which showed some weakness, and could give the Fed reasons to slowdown or pause on rates in December?
Was it Xi's speech at the China International Import Expo on Friday, where he said China remained committed to opening up to the outside world? It's global supply positive (helps with supply related inflation pressures). And it's global growth positive, which could reverse some of the flight to safety that has been driving the dollar higher.
Maybe all of the above have contributed to this move in the dollar, which looks like maybe early stages of a trend change (to lower dollar).