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如何把市场波动，变成投资机会？｜投资小知识
This article explains why downturns represent opportunities rather than risks using a valuation star rating system, and outlines three conditions to convert volatility into gains. 银 银行螺丝钉Follow·
Yesterday·1396 words (about 6 min)
AI Summary & Key Points
Summary
The article argues that 'volatility is not risk - permanent loss of principal is' and emphasizes that for index investing, risks emerge from price increases while opportunities arise from declines. Historical backtesting shows that buying 4-5 star undervalued stock funds yields positive expected returns with smaller volatility, while 3-star purchases generate mediocre returns and 1-2 star buys may incur 30-50% drawdowns. Using the Shanghai-Shenzhen 300 Index as an example, the author explains that indices represent continuously profitable leading companies with valuation floors (typically oscillating between 10-15x P/E) that prevent total collapse. The article highlights the '3-star avoid, 4-star reduce, 5-star increase' discipline of state investors and stresses that buying undervalued assets isn't about short-term prediction but improving long-term cycle success rates. It concludes with three conditions to turn declines into opportunities: using long-term idle funds, selecting appropriately volatile assets, and maintaining disciplined buying without leverage.
Main Points
* 1. Volatility downturns are not risks - permanent loss of principal is the real risk.
For index investing, downturns without profit deterioration simply lower entry prices while increasing long-term expected returns.
* 2. The valuation star rating system determines the probability and potential of investment success.
Backtesting shows 4-5 star undervalued purchases yield positive returns with smaller volatility, while 1-2 star overvalued buys risk 30-50% losses - lower valuations are more favorable.
* 3. Indices have valuation floors and cannot decline indefinitely.
The Shanghai-Shenzhen 300 represents continuously profitable leading companies, with valuations typically fluctuating between 10-15x P/E that prevent total collapse.
* 4. Three conditions are needed to turn volatility into opportunity.
Use long-term idle funds, select assets with acceptable volatility risk, and maintain disciplined buying without leverage during undervalued periods.
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银行螺丝钉 2026-08-04 21:33 北京
!Image 2 文 | 银行螺丝钉 （转载请注明出处） #螺丝钉小知识
银行螺丝钉
如何把市场波动，变成投资机会？
投资中，波动下跌并不是风险。真正的风险，是本金永久性损失的风险。
账户一跌，很多人的第一反应，是风险变大了。其实，对指数投资来说，风险是涨出来的，机会是跌出来的。
如果背后公司的盈利没有恶化，下跌只是让买入变得更便宜。估值越低，长期的预期回报反而在抬高。
之前咱们也回测过：
• 在4-5星低估的时候买入股票基金，未来几年的预期回报为正，并且波动风险也会更小；
• 在3星买入股票基金，未来的预期回报比较低，波动风险也变大；
• 在2-1星买入股票基金，未来要承担30%-50%的亏损，波动风险也会更大。
买入估值越低，对未来的回报越有利，承担的风险也更小。
也有朋友会有疑惑，那股票市场下跌，不会跌没么？
如果上市公司正常盈利，那股价会有波动，但不会无止境下跌。
例如沪深300，背后有300家各行各业的头部公司。这些公司稳定盈利的情况下，沪深300的估值，通常在10-15倍市盈率上下波动。
遇到熊市悲观的时候，估值会低一些；遇到牛市乐观的时候，估值会高一些。但不会无止境下跌。
如果沪深300跌没，意味着，像各大银行、保险、水电站、石油石化、芯片科技……这些公司通通白送。现实生活中，白送一部手机都很少见，更何况是每年盈利几千亿的公司白送。
所以指数波动是有底线的。在这个底线的基础上，越下跌低估，投资机会也会越好，投入的资金也适合更多。
这里我们可以参考下，国家队等机构，对指数基金的「低买高卖」。
3星不投，4星少投，5星重投。这就是国家队对指数基金的投资。
实际上，在5点几星的时候，股票指数基金最大下跌，一度达到了40%级别。单纯从跌幅上，是会让很多投资者恐慌的。
但是在下跌之后，当时指数基金的估值，也创下了最近10年的最低水平。投资价值反而是很高，值得大笔投入的。
买入的时候检查估值，不是为了猜第二天涨还是跌。短期涨跌，没有人能稳定预测。
估值给出的，是这笔买入，在未来一轮牛熊市的维度上，胜率和空间。低估买入，正常估值持有，高估卖出。一轮走完，靠的不是预测，而是纪律。
当然，低估买入之后，也要做好，坚持一轮完整牛熊周期的心理准备。
不过，估值只回答了值不值得买，没回答能不能拿得住。
想让下跌真正变成机会，还需要三个条件。
（1）用长期不用的闲钱投资。
跌的时候才没有被迫卖出的压力。
（2）选择波动风险能接受的品种。
个股的波动，通常超过行业主题；行业主题指数波动，又超过宽基指数。基金组合的波动比宽基通常略小。
如果觉得股票基金的波动大，也可以控制好比例。例如配置50%的股票基金+50%的债券基金，波动也会进一步下降。
根据自己的风险承受能力选择。投资，买自己能睡得着觉的品种。
（3）守住底线，越低估可以买得越多，但不借钱投资，不上杠杆。
风险提示
本文仅为信息分享，不构成任何投资建议。市场有风险，投资需谨慎。
基金投资组合策略过往业绩并不预示其未来表现，为其他客户创造的收益并不构成业绩表现的保证。
基金投资组合策略具有市场风险、信用风险、流动性风险、法律风险以及其他投资风险等，其风险特征与单只基金产品的特征存在差异，可能存在基金投资组合策略成分基金风险等级高于基金投资组合策略风险等级的情况。
基金投资顾问业务尚处于试点阶段，存在因试点资格被取消不能继续提供服务的风险。 ▼点击阅读原文，免费学习大额家庭资产配置课程 阅读原文
Key Quotes
> Risk comes from price rises, opportunity comes from price falls.
> Valuation determines the probability and potential of success in the dimension of a full bull-bear market cycle.
> Check valuation at purchase not to predict short-term price movements, but to establish long-term positioning.
Tags
Investing & Markets
Index Funds
Valuation Analysis
Asset Allocation
Value Investing
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