Loading ...I believe its widely known that all commodities are priced in US Dollars. So, if everyone buys Dollars one day, it automatically pushes the other currencies inverse down. Or up like today with people or the news causing selling of US Dollars, pushing all currencies up.
https://finviz.com/futures_charts.ashx?t=CURRENCIES&p=d
The strongest currency, the Swiss Franc AU up 5.25%, the weakest one is the Yen AU up 11%