Here is a clear and beginner-friendly Investor Insight on John C. Bogle, the father of index investing:
🧠 John C. Bogle: Investor Insight
👤 Who Was John C. Bogle?
- Founder of The Vanguard Group
 - Creator of the first index mutual fund for individual investors (1976)
 - Advocate for low-cost, long-term, and passive investing
 - Nicknamed: “Saint Jack” by his followers for putting investors first
 
💡 Key Investment Principles from John C. Bogle
1. Invest in the Whole Market
❝ “Don’t look for the needle in the haystack. Just buy the haystack.” ❞
    Instead of trying to pick winning stocks, Bogle
        said:
        ➡️ Buy a low-cost index fund that owns
        everything (like the S&P 500)
    Why?
        📊 Over time, the market as a whole grows, and few active
        managers beat it consistently.
2. Keep Costs Low
❝ “In investing, you get what you don’t pay for.” ❞
    High fees eat away at returns.
        That’s why Bogle created Vanguard funds with
        ultra-low fees.
Example:
- Traditional mutual fund fee: ~1.5%
 - Vanguard S&P 500 ETF fee: ~0.03%
 
💰 Over 30 years, that makes a huge difference.
3. Time in the Market > Timing the Market
❝ “The stock market is a giant distraction from the business of investing.” ❞
Bogle warned against:
- Chasing trends
 - Trying to predict highs and lows
 - Frequent buying and selling
 
✅ His advice: Stay invested long-term and ignore the noise.
4. Buy and Hold
Once you own a good index fund:
- Don’t trade it
 - Don’t panic
 - Just hold it for decades
 
📈 The long-term U.S. market trend is up, despite short-term drops.
5. Stay the Course
❝ “The most important rule is to stick to your plan.” ❞
Even during crashes or downturns, Bogle advised:
- Don’t sell in fear
 - Keep investing regularly
 - Trust in long-term growth
 
📦 Bogle’s Investing Summary
| Principle | What It Means | 
|---|---|
| Buy index funds | Own a broad slice of the market | 
| Keep costs low | Fees compound — lower is better | 
| Don’t time the market | Stay invested through ups and downs | 
| Long-term focus | Let compounding work over years, not months | 
| Simplicity is power | No need to be fancy or risky to succeed | 
🔑 Famous Bogle Quotes
| Quote | Meaning | 
|---|---|
| “Stay the course.” | Stick with your plan, no matter what. | 
| “The miracle of compounding returns is overwhelmed by the tyranny of compounding costs.” | Even medium fees ruin your long-term wealth. | 
| “Index funds eliminate the risks of individual stocks, sector bets, and manager selection.” | Simple index funds remove unnecessary risk. | 
📚 Legacy: What He Gave to the World
- Brought investing to the average person
 - Created the idea that you don’t have to be rich to invest wisely
 - Helped investors save billions of dollars in fees
 - Inspired the FIRE (Financial Independence, Retire Early) community
 
🇰🇭 In Khmer (Summary):
លោក John C. Bogle ជាអ្នកបង្កើតប័ណ្ណទុន Index ដំបូងសម្រាប់អ្នកវិនិយោគធម្មតា។ គាត់ផ្តល់អនុសាសន៍ឲ្យវិនិយោគក្នុងទុនដែលគ្របដណ្តប់ទីផ្សារទាំងមូល (S&P 500) ដោយមានការចំណាយទាប។ គាត់ជឿថាការរកស៊ីវិនិយោគត្រូវតែសាមញ្ញ មានអត្រាការចំណាយទាប ហើយចាំឲ្យមានការរីកចម្រើនបែបរយៈពេលវែង។
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