First time post - PP/GB investment noob with a (maybe convoluted) "international" PP question.
I understand the concepts of the PP within the US economy and for US residents but I just can't wrap my head around the "internationalization" theory/recommendations - hopefully someone will be able to point me to the right resources...
For international investors, Craig Rowland recommends in his PP book a total world equities ETF (the currency of which can be USD) and bonds/treasuries in the currency of the country of residence. Yet:
- while this recommendation seems to be accepted by most people, there are dissenting opinions (but then there's not much justification).
- it's aimed at people who have a long-term country of residency, not "itinerant" people.
- given the assumption that the PP was originally devised for the US economy with its asset classes' volatilities "working" alongside, having stocks covering a given region (eg. the whole world) while limiting treasuries/bonds to a smaller region (eg. Germany) doesn't seem to be in accordance with the PP's assumption, except if said bonds are highly correlated to the stock's region (in that case, "total world"). But if I'm not mistaken, comparing charts like BNDW or US 10Y vs Germany 10Y shows it's definitely not the case (also, given the US' overweight, comparing US and DE 10Y confirms this - eg. [1] or [2])
- a better fit for the PP's theory would thus seem to be to have a total world bonds ETF instead (that approach is sometimes advocated).
- Craig's recommendation seemed to be given to avoid currency fluctuation/risk; however the currency risk of having bonds and stocks in different currencies is unclear (to me), vs. the currency risk of having both bonds and stocks in a same currency (eg. USD) different than the current country of residence's currency.
- wouldn't separate portfolios, each targeting a single economy and each held in the target economy's currency, make more sense ? Ie. if following each country's % of global stocks, 40% of the total assets on a US portfolio containing only US stocks/treasuries/cash held in USD, 8% of a "Japan" portfolio held in JPY, etc. (gold would be global). Of course this would be impractical to implement for all countries but the point here is theoretical. (One could also pick the first n world economies and build n portfolios).
- I've spent a significant amount of time combing the forum for "international PP" posts (up to year 2017) ; there were a few interesting posts but none really addressed my question (and/or there were only fragments of info here and there). I can post a list of relevant posts I found in case someone's interested.
- I also began reading boglehead forum posts but it's really all over the place (with many "I think", "If I were you", "I don't like gold", ...). There are probably revelant posts though, just couldn't find them.
- I posted a similar question on Tyler's new discord forum but it didn't attract much interest.
- I know I could backtest scenarios (and I've done so) but again I'm more interested in the theory.
- the root of my question/post comes down to my personal status, which is a a bit exotic: Swiss national, living in SE-Asia (remote worker), with family/business ties to EU/Switzerland, considering relocation (not necessarily in Europe but I would still have some EU/CHF expenses). But at that stage I'm only interested in understanding the PP's theory so to avoid making a complex subject even more complex I'm ignoring any tax implication for now.

Cheers !
[1] https://economic-research.bnpparibas.co ... 2021,40683
[2] https://www.investing.com/rates-bonds/de-10y-vs-us-10y