January 4th, 2013, 2:09 pm
the matrix _points_ on VCAP3 (ln vol), VCAP3A (shifted ln vol) and VCAP4 / VCAP5 (Cap / Floor Premia) are very consistent from what I calculate, i.e. you can reproduce the quoted premia from both ln and shifted ln vol. Inter- / Extrapolated prices are of course model dependent and in particular different when interpolating on VCAP3 or 3A.the problem might more be of an infrastructure nature, as clients might directly use the quoted vols for their valuation systems. Every change as to shifted ln or premium inputs would then cause major work to adapt the systems.