If a curve shifts, the underlying relationship between the two variables has changed is a true statement.
A shift in the demand curve is known to be a term that connote if a determinant of demand other than price are altered.
It is known to be a term that takes place if the demand for goods and services are known to changes even if the price did not change.
Hence, If a curve shifts, the underlying relationship between the two variables has changed is a true statement.
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