Most of the return in a long-term portfolio comes from decisions made once and then left alone: how much to hold in growth assets, how widely to diversify, and what you agree in advance to do when markets fall
The rest, the fund selection, the timing, the clever tilts, matters far less than the industry's marketing would suggest.
A written policy that says what you will do in a twenty percent drawdown is worth more than any forecast, because it removes the decision from the moment when judgement is worst
Target allocation agreed and written down
Rebalancing on a rule, not a hunch
Costs measured as a share of return
Over a thirty-year horizon a small difference in fees or a single panicked exit can outweigh years of good selection. These four factors do most of the work, and all of them are within your control
None of them require predicting anything. That is precisely why they are dependable.
Contribution rate, sustained through cycles
Total cost, including the costs not itemised
Tax treatment of where assets are held
Behaviour during the worst three months
The portfolios that do best over decades tend to look unremarkable at every individual point in time. Their advantage is that nothing dramatic was ever done to them
Choose an allocation you can hold through a bad year, then spend your attention on contributions rather than on markets.
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