Warren Buffett on Efficient Market Hypothesis

According to the proponents of the Efficient Market Hypothesis, stock prices reflect all available information about companies and investors can’t beat the market indexes by stock picking. They say investors trying to find a secret formula are wasting their time because stock prices follow a random walk. Interestingly, this theory also implies that a monkey selecting stocks by throwing darts at a newspaper’s financial pages should perform as well as any star hedge fund manager who may or may not use inside information.

Warren Buffett

You could guess how this was such a huge relief for millions of stock market investors. Suddenly, one need not worry about timing or stock picking skills. Since all the information is incorporated into stock prices, there’s no need to do any research about the companies, or the macro economic developments, or the regulatory environment. Nothing, nada. Do you want to invest in an internet start-up that sells toys, with $30 million in revenue, $50 million in losses and $6 billion in market cap? Don’t worry. Markets are efficient. Just buy it, as simple as that.

In 1984, Warren Buffett gave a speech at the Columbia Business School, arguing that the superinvestors of Graham-and-Doddsville can beat the market by a huge margin. The “look for values with a significant margin of safety relative to prices” approach has been deemed out of date by college professors such as Eugene Fama. Yet Warren Buffett and several investors who took Ben Graham’s course managed to beat index funds by following the value approach.

Twenty six years ago Warren Buffett said that 9 investors independently investing in different companies achieved far superior returns than did index funds. He said:

“So these are nine records of “coin-flippers” from Graham-and-Doddsville. I haven’t selected them with hindsight from among thousands. It’s not like I am reciting to you the names of a bunch of lottery winners — people I had never heard of before they won the lottery. I selected these men years ago based upon their framework for investment decision-making. I knew what they had been taught and additionally I had some personal knowledge of their intellect, character, and temperament. It’s very important to understand that this group has assumed far less risk than average; note their record in years when the general market was weak. While they differ greatly in style, these investors are, mentally, always buying the business, not buying the stock. A few of them sometimes buy whole businesses. Far more often they simply buy small pieces of businesses. Their attitude, whether buying all or a tiny piece of a business, is the same. Some of them hold portfolios with dozens of stocks; others concentrate on a handful. But all exploit the difference between the market price of a business and its intrinsic value”

I’m convinced that there is much inefficiency in the market. These Graham-and-Doddsville investors have successfully exploited gaps between price and value. When the price of a stock can be influenced by a “herd” on Wall Street with prices set at the margin by the most emotional person, or the greediest person, or the most depressed person, it is hard to argue that the market always prices rationally. In fact, market prices are frequently nonsensical.”

Finally, here’s the quote of the month from Warren Buffett:

“Ships will sail around the world but the Flat Earth Society will flourish. There will continue to be wide discrepancies between price and value in the marketplace, and those who read their Graham & Dodd will continue to prosper.”

blog comments powered by Disqus
Insider Monkey Headlines
Insider Monkey Small Cap Strategy
Insider Monkey Small Cap Strategy

Insider Monkey beat the market by 52 percentage points in 24 months. Our beta is only 1.2 (don't click this link if beating the market isn't important to you).

Lists

Shopaholics Rejoice: The 12 Biggest Malls in the World

Fright Night: 10 Horror Movies Based on True Stories

Mach Mania: The 10 Fastest Jets in the World

Military Heavyweights: The 10 Countries with the Most Tanks

All In: The 7 Richest Poker Players in the World

Abracadabra: The 10 Best Magicians in the World

The 10 Richest Asian Countries in the World in 2014

Eyes in the Sky: 10 Things You Need to Know About Drones

Rising Stars: The 6 Best Silicon Valley Startups

Military Muscle: The 5 Most Advanced Armies in South America

All that Glitters: The 7 Most Luxurious Jewelry Brands in the World

5 Things You Didn’t Know About ISIS but Should

Empowering Your Money: The 5 Best Energy Stocks to Invest In

The 11 Best Android Apps You Can’t Get on iOS

The 10 Most Important International Conflicts in 2014

Mood Enhancers: The 20 Most Uplifting Songs of all Time

Lover Beware: The 8 Countries that Cheat the Most

Breath of Fresh Air: The 25 Countries with the Best Air Quality on the Planet

Singles Beware: The 8 Worst Mistakes Made on First Dates

Healthy and Happy: The 10 Countries with Lowest Healthcare Costs

The 6 Best Company Team Building Activities to Build Workplace Camaraderie

Ships Ahoy: The 10 Busiest Shipping Ports in the World

10 Productivity Tips to Save You Time and Help You Do More With Less

Grab a Bite: The Most Popular Fast Food Restaurants in America

Friday Night Thirst: The 10 Most Popular Cocktails in the World

The 6 Greatest Unsolved Mysteries We May Never Figure Out

7 Useless Products You Never Should’ve Bought

The 5 Reasons Why You’re Single and Miserable

The 7 Most Addictive Foods in the World We Can’t Stop Eating (Even Though We Should)

5 Amazing Places You Can Swim with Dolphins

The Top 7 Most Livable Countries In The World

The 10 Most Expensive Baseball Cards Ever Pulled From A Pack

The 5 Easiest Second Languages to Learn for English Speakers

Silver Spoon: The 6 Richest Families in the World

The 20 Countries with the Largest Prison Populations in the World

The Top 10 Richest Actors in the World

The 10 Best Airline Stocks to Invest In Before They Fly Too High

Burger Kings: The 10 Most Expensive Burgers in the World

The 10 Most Ethnically Diverse Countries in the World

The 10 Most Exclusive Credit Cards in the World

The 10 Most Expensive Cruise Ships in the World

The 10 Fastest Supercomputers in the World

The 10 Best Countries for Doing Business 2015

6 Most Expensive Fruits In The World

10 Worst Airlines in the World

The 10 Biggest Tax Havens in the World to Stash Your Money

The 15 Most Murderous Countries in the World

10 Largest Colleges in the World: Bigger Isn’t Always Better

Comedians in Cars Getting Coffee: The 6 Comedians Seinfeld Needs to Interview

Easy Money: The 10 Most Successful Investors in the World Today

Subscribe

Enter your email:

Delivered by FeedBurner

X

Thanks! An email with instructions is sent to !

Your email already exists in our database. Click here to go to your subscriptions

Insider Monkey returned 47.6% in its first year! Wondering How?

Download a complete edition of our newsletter for free!