It's been said that rebalancing your portfolio can improve returns because you're selling high and buying low. The US stock market has been quite volatile lately, and I find myself rebalancing a bit more often. It occurs to me that more frequent rebalancing could further improve returns. If that is true, those improved returns must be captured within a balanced portfolio ETF, correct? How often do they typically rebalance? Is there a way to see the effect of this rebalancing within their total returns?