Japanese Yen is 2.36x larger than British Pound. This page compares the live size of Japanese Yen and British Pound.
Relative size = British Pound 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 British Pound as Asset B, using British Pound fx market cap as the target size.
Relative size = British Pound fx market cap / Japanese Yen fx market cap.
Direction matters. Japanese Yen with British Pound's fx market cap is different from British Pound with Japanese Yen's fx market cap because the starting price, supply, shares, or size metric changes.