emerging markets analysis concerned, following, emerging, relation, between

SkipE99

hi
i am concerned about the emerging markets analysis for the following two situations

1. why is PPE better forecasted in real terms

2. why is WC Inv better forecasted in norminal terms

in most cases, the relation between nominal PPE and nominal WC inv is given and we go from real analysis to nominal analysis and switch back again to get the real analysis. any thoughts on this.

thanks in advance