市场下跌时DCA投资方法。

-估计好政治经济趋势。这是时刻要进行的。特别每次下单前。

-从适合的起点开始。分时分批进行。

-买关盘价是一个好的选择。关盘前决定。特别适合共同基金。

-每次的量正比于跌的幅度（也可以非线性）。大掉是买的好机会。没跌就不加。

-不用马金。

由于不知道底所以要DCA.

但是可以估计底的范围。保证有现金。

这是一般方法。随时灵活发挥。

https://en.wikipedia.org/wiki/Dollar_cost_averaging

In dollar cost averaging, the investor decides on two parameters: the fixed amount of money invested each time, and the time horizon over which all of the investments are made. With a shorter time horizon, the strategy behaves more like lump sum investing. One study has found that the best time horizons when investing in the stock market in terms of balancing return and risk have been 6 or 12 months.^[7]

One key component to maximizing profits is to include the strategy of buying during a downtrending market, using a scaled formula to buy more as the price falls. Then, as the trend shifts to a higher priced market, use a scaled plan to sell. Using this strategy, one can profit from the relationship between the value of a currency and a commodity or stock.[citation need