i have some reservations of the SG-implementations of the PP.
the important point of PP in the book is, that different asset classes behave differently in different cycles. if all 4 asset classes are in the same economy, e.g. US, the reasoning makes a lot of sense. and i buy that theory.
now, in SG context, we still buy Gold in USD, but we put equities in SG market, and buy Local SG Gov Bond. the Gold subject a lot to the USD value that subject to US Fed policy. the SG equities and Bonds subject to SG Gov Policy and around this region(of course some US factors as well).
if we do this, does that theory of different behaviors of different asset classes in different economic cycles still hold well? Have we weakened those uncorrelated relations among the asset classes?
i am not implying it fails completely, but i am just thinking that the diversification benefit due to the inherent correlations is reduced.
sometimes i think, perhaps we should just adopt the PP entirely in the US context, buy all 4 classes according to the book's list. then use a Variable portfolio in local context.