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effective rate

実勢 ／ effective-rate　—　Measuring

Not the official line, but what is actually the case.

Mannen Tsūhō Mannen TsūhōAD 760– Draped Bust dollar Draped Bust dollarDated 1796
A photograph of the real thing this term names.

When the official value and the actual market rate are far apart, historical sources often record only the official value. The actual market rate can only be inferred indirectly from account books or price records.