In college, except for the obligatory courses, I avoided science, math, and accounting — all the normal preparations for business. I was on the arts side of school, and along with the usual history, psychology, and political science, I also studied metaphysics, epistemology, logic, religion, and the philosophy of the ancient Greeks. As I look back on it now, it’s obvious that studying history and philosophy was much better preparation for the stock market than, say, studying statistics. Investing in stocks is an art, not a science, and people who’ve been trained to rigidly quantify everything have a big disadvantage

To make this spectacular showing, you only had to find one big winner out of eleven. The more right you are about any one stock, the more wrong you can be on all the others and still triumph as an investor.

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It takes remarkable patience to hold on to a stock in a company that excites you, but which everybody else seems to ignore. You begin to think everybody else is right and you are wrong. But where the fundamentals are promising, patience is often rewarded — Lukens stock went up sixfold in the fifteenth year, American Greetings was a sixbagger in six years, Angelica a sevenbagger in four, Brunswick a sixbagger in five, and SmithKline a threebagger in two.

Peter Lynch doesn’t advise you to buy stock in your favorite store just because you like shopping in the store, nor should you buy stock in a manufacturer because it makes your favorite product or a restaurant because you like the food. Liking a store, a product, or a restaurant is a good reason to get interested in a company and put it on your research list, but it’s not enough of a reason to own the stock! Never invest in any company before you’ve done the homework on the company’s earnings prospects, financial condition, competitive position, plans for expansion, and so forth.

A decline in stocks is not a surprising event, it’s a recurring event — as normal as frigid air in Minnesota. If you live in a cold climate, you expect freezing temperatures, so when your outdoor thermometer drops below zero, you don’t think of this as the beginning of the next Ice Age. You put on your parka, throw salt on the walk, and remind yourself that by summertime it will be warm outside. A successful stockpicker has the same relationship with a drop in the market as a Minnesotan has with freezing weather. You know it’s coming, and you’re ready to ride it out, and when your favorite stocks go down with the rest, you jump at the chance to buy more.

This is a crucial safeguard of our capitalist system, because if shareholders could be sued whenever a company made a mistake, people like you and me would be afraid to buy shares and become investors. Why would we want to run the risk of being held responsible for another big oil spill, or a rat hair in a hamburger, or the endless variety of mishaps that occur in business every day? Without limited liability, nobody would want to buy a single share of stock.

There are five basic ways a company can increase earnings*: reduce costs; raise prices; expand into new markets; sell more of its product in the old markets; or revitalize, close, or otherwise dispose of a losing operation.

First, you find the “market capitalization” (“market cap” for short) by multiplying the number of shares outstanding (let’s say 100 million) by the current stock price (let’s say $100 a share). One hundred million times $100 equals $10 billion, so that’s the market cap for DotCom.com.

The trick is not to learn to trust your gut feelings, but rather to discipline yourself to ignore them. Stand by your stocks as long as the fundamental story of the company hasn’t changed.

In general, if you polled all the doctors, I’d bet only a small percentage would turn out to be invested in medical stocks, and more would be invested in oil; and if you polled the shoe-store owners, more would be invested in aerospace than in shoes, while the aerospace engineers are more likely to dabble in shoe stocks. Why it is that stock certificates, like grasses, are always greener in somebody else’s pasture I’m not sure.

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