My point is that the year 2007-2010 prices of this year's acquisitions, do not matter to a 30 year old buying into a retirement account. I see so many people dithering about valuations. Forty years from now, it doesn't matter if you paid + or - 10% of this year's price. If you invest monthly for 30 years, some purchases will be on the eve of bear markets and some will be on the eve of bull markets. Waiting until it is clear, is not a good plan. Worrying about bear markets is a waste of energy. Allocate well, but don't spend your time worrying about stuff that you cannot change, i.e. market returns.