第 7 课 / 共 10 课4:002 出处
定投(DCA):最简单的策略

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本课的完整中文翻译即将上线,你现在看到的是英文版。
DCA means investing equal amounts at regular intervals regardless of market conditions (FINRA).
- A fixed amount buys more units when prices are low and fewer when high.
- Example: $100 a month at prices 10, 8, 5, 8, 10 buys 65 units for $500 — average cost ≈ $7.69 vs average price $8.20; worth $650 at $10.
- Limits: FINRA notes DCA often returns less than lump-sum investing, especially over long periods, and per-trade fees can add up.
- Its main value is discipline: it removes some emotion and fits a monthly salary.
快速自测
三道题。选一个答案,查看原因。
1.$100 buys how many units when the price drops from $10 to $5?
2.In the lesson's example, why is the average cost per unit (~$7.69) lower than the average price ($8.20)?
3.What does FINRA say about DCA compared with lump-sum investing?
出处
本课中的每个事实都有以下出处支撑。
- 1.FINRA – The Benefits and Limitations of Dollar-Cost AveragingDCA definition; buys more shares when low and fewer when high; removes emotion; often lower returns than lump sum; may help limit losses in a significant decline
- 2.FINRA – Dollar-cost averaging (fees per transaction)Per-transaction commissions can make DCA costlier than lump sum
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