Why does increasing the number of asset classes guarantee a higher overall return? Is there any proof or intuition? Will increasing the number to 10 asset classes guarantee that you will consistently outperform VOO or VTI or VUG?
For a simplified model, check out Kelly gambling
So with that logic, shouldn't Betterment with its 12 asset classes and 0.15% fees for >$100k invested be more optimal?
Re. this question, it is addressed in the Wealthfront FAQ: https://pages.wealthfront.com/faq/
> What’s to keep me from investing $10,000 with you and then mimicking trades for my $250,000 portfolio at a discount broker?
> Nothing. But that kind of sounds like a pain in the neck when we only charge you an annual advisory fee of 0.25% (on assets over $10,000) to take care of all the trades in your account, as well as the periodic rebalancing and daily tax-loss harvesting. That being said, you are welcome to copy anything we do if you would rather do it yourself.