This suggests also that future formulae will not be as simple, either as the 3-months import rule or the Guidotti/Calvo Rule but will become increasingly complex. In thinking about this, I was reminded of the similarity of this process with the development of Basel Il guidelines on Banking Supervision.
Because of the need to measure every possible risk factor, those guidelines brought risk measurements to a new level of complexity and the measurement of bank soundness to such a level of intricacy, that the first draft was 600 pages, later refined to 300.