Peter Lynch - Investment Philosophy: Know What You Own

Lynch argues it's a tragedy that media has convinced small investors they can't compete with institutions. In reality, institutional dominance creates opportunities - they push stocks to unusual lows and highs, allowing individual investors to take their own informed positions. The institutional edge is a myth.

Lynch's most important principle: know what you own. If you can't explain why you own a stock to a 10-year-old in 2 minutes or less, you shouldn't own it. He satirizes complex tech companies with jargon-filled descriptions, contrasting with simple businesses like Dunkin Donuts where he made 10-15x his money because he could understand it completely.

Tagamet (ulcer drug) was a massive stock winner, and millions of nurses, doctors, and patients saw the product work for years before the stock peaked. Then GlaxoSmithKline brought Zantac, an improved product you could watch take market share. Ordinary people had years to invest based on direct product observation.

People have massive edges over Lynch in their own industries. If you work in aluminum and see inventory declining 6 months straight with demand improving, that's actionable intelligence. Auto dealers saw Chrysler packed with minivan buyers and could have made 10x on Chrysler stock. Ford's Taurus/Sable line yielded 7x returns. You only need a few great stocks per decade from your own industry knowledge.

When an industry goes from terrible to mediocre, stocks go up. Mediocre to good, stocks go up. Good to terrific, stocks go up. People in cyclical industries (aluminum, steel, paper, publishing) can spot these turns before Wall Street. Environmental regulations make it hard to build new capacity, creating predictable supply constraints.

Lynch warns against the fallacy of 'how much lower can it go?' Polaroid fell from $130 to $100, and people bought thinking it couldn't fall further. Within a year it was at $18 despite no debt. Just because a stock has fallen doesn't make it cheap - it might be overpriced even after the decline.

Lynch humorously notes we're in October - beware of all the years stocks went up in October. Market timing doesn't work. Nobody predicted the 1987 crash, the 1929 crash, or major market moves. Focus on companies, not predicting market direction.

Lynch emphasizes checking if companies can survive recession. Johnson & Johnson has no debt and massive cash - they can weather any storm. Companies with heavy debt in cyclical industries face bankruptcy risk. Understanding the balance sheet prevents catastrophic losses.

Lynch advocates convincing people to be long-term investors. Short-term trading rarely works. The real money is made by finding good companies and holding them as they grow. Patience and conviction in your research beats constant trading.

Lynch's research on Hanes: gave Leggs pantyhose to secretaries and asked them to compare it to competition. They came back in 3 weeks and said it wasn't as good. That simple research saved him from a bad investment. Research doesn't have to be complex - direct user feedback is incredibly valuable.