Japanese Yen is 3.44x larger than South Korean Won. This page compares the live size of Japanese Yen and South Korean Won.
Relative size = South Korean Won fx market cap / Japanese Yen 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 Japanese Yen 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 / Japanese Yen fx market cap.
Direction matters. Japanese Yen with South Korean Won's fx market cap is different from South Korean Won with Japanese Yen's fx market cap because the starting price, supply, shares, or size metric changes.