QUOTE(T231H @ Aug 20 2016, 12:17 PM)
yes, that is for the whole portfolio of one wealth....
but if one were to break down the area/classes of diversification....it is "best" to breakdown into a few for more diversification....
ex.....if one is just holding 1 credit card.....if that one card malfunction....die lah.....
having 2 CC of different banks may be better right?
if one is already set to have 15% of his UT investment portfolio in Asia Pac ex jpn.....why put all eggs into Ponzi 2.0 when can have Ponzi 1 & 2 at 7.5% ea?
Less talk MOAR mathematics!but if one were to break down the area/classes of diversification....it is "best" to breakdown into a few for more diversification....
ex.....if one is just holding 1 credit card.....if that one card malfunction....die lah.....
having 2 CC of different banks may be better right?
if one is already set to have 15% of his UT investment portfolio in Asia Pac ex jpn.....why put all eggs into Ponzi 2.0 when can have Ponzi 1 & 2 at 7.5% ea?
Let's take two UTF A & UTF B
Recall the standard formula for portfolio std dev is sqroot of [(w1r1)^2+ (w2r2)^2 + 2w1r1w2r2 x (Corr-Coeff)]
where w = weighting of the UTF, r = risk aka std-dev
In one scenario, where there is little diversification the corr-coeff will be around 1, lets that = 1. Now you put that into the equation, you will see the overall portfolio std-dev will increase. That is why we say little diversification is bad, as shown mathematically.
In another scenario, where there is very good diversification, let's give the corr-coeff = zero. Now you will see the bolded part of the equation becomes zero. Do you see now the portfolio std-dev becomes less than the first scenario?
Hence back to T231H's assertion that putting 7.5% each into Ponzi 1 & 2 instead of into either one only. You check the corr-coeff btw Ponzi 1 & 2, you will see the corr-coeff is very high probably > 0.90, which is close to 1 which means no diversification at all.
T231H, actually, if you do that, that is, putting 7.5% each into Ponzi 1 & 2, instead of reducing risk, you are actually increasing it. Why? Coz numbers don't lie.
Xuzen
This post has been edited by xuzen: Aug 20 2016, 02:54 PM
Aug 20 2016, 02:52 PM

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