After a major flood, 40% of business survey responses are missing for one quarter. Standard approach: Impute missing values using historical trends — possible bias. E239 Grace approach:
Without a grace provision, strict adherence to GDP rules during anomalies can produce misleading signals — e.g., a false contraction due to delayed surveys rather than real output loss. E239 Grace allows statisticians to:
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Maintaining Stability Through Measured Flexibility in National Accounts