At best one could say , that the inferred price magnitudes are based on observable price magnitudes , but the link between them can be rather tenuous , since specific valuation assumptions may be introduced .
The calculation procedure goes far beyond a simple arithmetical aggregation .
At best one could say , that the inferred price magnitudes are based on observable price magnitudes , but the link between them can be rather tenuous , since specific valuation assumptions may be introduced , so that the calculation procedure goes far beyond a simple arithmetical aggregation .