For tax purposes and because of tax rules in my country. It is not tax efficient to, say arrange my stocks and bonds portfolio to 80/20, or 60/40, or according to my age every year. I pay a tax penalty on every gain. If one ticker (I guess an ETF would be the way to go here, as standard ETFs are available all over the world) included the stocks and bonds portion, too, I would be the winner! :)
Is there a market for such an ETF, for non-US investors? How to make one? Difficult?
Oh, and I would invest in the same underlying assets as US folks do. Home country bias is stupid.