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If you come into a huge pile, then just put it into something liquid and low risk (like a money market) and do an slow and orderly transition into your eventual preferred investing model. (Essentially, buy 2-10% of what you want to own a month). Like everyone is saying don't time the market. Think of it as a reverse of what the retirees are doing; you end up trading dollars (unmade dividends/gain) for lower risk. I would never bothering doing it with less then a couple of million.
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Vanguard, among others have studies that show that dollar cost averaging earns less than investing a lump sum right away due to a) time not in the market and b) dividends lost for the uninvested funds.
If you have some $ you aren't going to touch for a few+ years, sink it.
It takes guts when the market is (literally) at a new all time high, but look back a year, 2 years, 3, 10 when people were saying the same thing and have been waiting for a "magical" 10% correction that never came.
Like one of CNBC's financial pundits said, either the market is at an all time high or it isn't.