The essence of all such plans-except the simple case of dollar averaging-is that the investor automatically does some selling of common stocks when the market advances substantially.

所有这些计划，除了简单的“美元均摊成本法”情况外，其本质都是当股市涨幅很大时抛售一些普通股。

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Toyota could end up doing even better than its forecasts, as it is counting on the dollar averaging at 81 yen for the fiscal year, while it's already at 92 yen levels in recent sessions and could rise further.

NPR: Toyota Raises Annual Forecasts On Profit Rise

The strategy works well inside 401(k)s and other retirement plans because of dollar cost averaging (DCA).

FORBES: Make The Most Out Of Your 401(k) Contributions Right Now

Brokerage commissions can also whack total return in strategies that involve frequent trading, such as dollar cost averaging.

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