Euro is 6.57x larger than South Korean Won. This page compares the live size of Euro and South Korean Won.
Relative size = South Korean Won fx market cap / Euro fx market cap.
Fiat comparisons use money-supply and currency-rate based size metrics, so the result is a supply-scale comparison rather than a spot FX forecast.
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It compares Euro as Asset A with South Korean Won as Asset B, using South Korean Won fx market cap as the target size.
Relative size = South Korean Won fx market cap / Euro fx market cap.
Direction matters. Euro with South Korean Won's fx market cap is different from South Korean Won with Euro's fx market cap because the starting price, supply, shares, or size metric changes.