Q: I read with interest your recent article in the Post and was intrigued by the comment that research shows 90% of portfolio returns come from sector allocation - if a person wanted to take advantage of that, in a simple, easy to manage and inexpensive way (ignoring taxes for the moment) what would be your view be on an approach where one's equity component of their portfolio consisted entirely of a number of ETF's with each one of the ETF's focused on a particular sector, with a periodic (say quarterly) rebalancing? What specific ETF's would you suggest for such a portfolio? Thank you.