Rob, I'm going to try my luck and ask about investing in a trading discussion.. I just finished Antti Ilmanen's latest book and naturally have read Smart Portfolios and related blogs posts. Consider brave investor starting from scratch with long-only ETF's (no shorting, no leverage, no advanced trading methods). In order to harvest all the diversification benefits with given constraints, would you diversify developed equities into countries as in the book or would it make more sense to diversify into styles as much is possible (beta + carry, defensive, momentum, value) as in the following example? In addition, would you equal weight the styles? Of course we can't fully benefit from style premias without going short but at least the following is not 100% beta and it's cheap and easy to implement. There is a lot more beta per region than the ideal 20% but the question is which is less worse approach, by countries or by styles.
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