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