Gerrit,
Edward Smith's advice is very solid. There are many other good comments here. Permit me to throw my two cents in as well.
If one looks at the most common form of dollar cost averaging, monthly contributions to a 401(k) plan, you will see that the markets are up one month and down the next month, then flat the next. Over the longer term these peaks and valleys “average out”.
When one is investing a without the constraints of a 401(k) plan, dollar cost averaging still makes sense. The trick is to be disciplined enough to stick to the plan. In investing, human nature can get the best of us. For example, we see an area of the market or a mutual fund that has done very well over the last year, and we want to jump in with both feet. Or, we see an area of the market that has done poorly so we don’t want to put our money there. The truth is we don’t know which area of the market or mutual fund is going to have the best performance this year or next year. The poor performer is at least just as likely to be the hot ticket next year as not, and today’s darling may be tomorrow’s dog.
There are numerous studies that show institutional investors, such as pension funds, fare better than individual investors. We believe that much of the difference in performance can be attributed to the fact that institutions tend to have long-term strategic asset allocations and have a more disciplined approach to investing.
We believe there are ways to reduce risk and enhance return by using a more dynamic dollar cost averaging process, but that requires ones eye to be on the markets on a day-by-day minute-by-minute basis. For example, a pension fund may commit to allocating $40 million to an S&P 500 index fund. They could decide to invest in four tranches over a one year period, a $10 million investment each quarter. They may accelerate a tranche if the S&P falls 10%, and accelerate the second payment if the S&P falls another 10%, and so forth. They are committed to being invested in the S&P 500 over the long-term, and understand that they are getting it cheaper when it is down. Not to confuse the matter, but this is a viable approach for a pension fund, advisor, or an active investor, and demonstrates the discipline necessary to stick to ones guns when the markets are choppy, and the pundits are predicting doom.
Rebalancing goes hand-in-hand with dollar cost averaging. Many investors ride an asset to the top and back down again, rather than rebalancing.
Dollar cost averaging and rebalancing the portfolio (to a strategic asset allocation) are ways to capture gains and reduce risk, these approaches lead to realizing gains and getting into relatively cheap areas of the market.
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