Many financial advisors recommend that you diversify for your own protection. What they fail to tell you is that it is also for their protection. Since most financial advisors cannot tell you exactly which stock or mutual fund is a great investment, they tell you to buy a bunch of them.

The banking business is no favorite of ours. When assets are twenty times equity - a common ratio in this industry - mistakes that involve only a small portion of assets can destroy a major portion of equity. And mistakes have been the rule rather than the exception at many major banks.

The lessons of history would suggest that civilisations move in cycles. You can track that back quite far - the Babylonians, the Sumerians, followed by the Egyptians, the Romans, China. We're obviously in a very upward cycle right now, and hopefully that remains the case. But it may not.

Low-cost, high-grade coal, oil and natural gas - the backbone of the Industrial Revolution - will be a distant memory by 2050. Much higher-cost remnants will still be available, but they will not be able to drive our growth, our population and, most critically, our food supply as before.

If you were to just design the perfect retirement plan, you would own the stock market or you would own the bond market. You would get all the costs or all that you possibly could out of the system. So on an annual basis, if the market went up 8 percent, you would get 7.8 or 7.9 percent.

A subset of CEOs is that of entrepreneurs. And the classical definition of an entrepreneur is an individual who pursues opportunity without regard to the resources currently controlled. That sounds like a very different person than one might expect an analytical investment manager to be.

The power of "can't": The word "can't" makes strong people weak, blinds people who can see, saddens happy people, turns brave people into cowards, robs a genius of their brilliance, causes rich people to think poorly, and limits the achievements of that great person living inside us all.

In the 20th century, the United States endured two world wars and other traumatic and expensive military conflicts; the Depression; a dozen or so recessions and financial panics; oil shocks; a flu epidemic; and the resignation of a disgraced president. Yet the Dow rose from 66 to 11,497.

But 300 million Americans, their lending institutions, their government, their media, all believed that house prices were going to go up consistently. And that got billed into a $20 trillion residential home market. Lending was done based on it, and everybody did a lot of foolish things.

You should be unconcerned about short-term price action when you own the securities directly, just as you were unconcerned when you owned them indirectly through BPL. I think about them as businesses, not "stocks", and if the business does all right over the long term, so will the stock.

I don't try and guess when to get in and out of the market. I have owned stocks consistently since 1942. I owned the - I was buying stocks the day before the election. I was buying the same stocks the day after election. And if Hillary had been elected, it would have been the same thing.

In ninth grade, I came up with a new form of rebellion. I hadn't been getting good grades, but I decided to get all A's without taking a book home. I didn't go to math class, because I knew enough and had read ahead, and I placed within the top 10 people in the nation on an aptitude exam.

Microsoft does not dominate the software industry by any stretch of the imagination. We have lots of very able competitors who keep us constantly vigilant, and sometimes they beat us to the punch. Microsoft's success to date is based solely on the fact that people like Microsoft software.

In investing, you get what you don't pay for. Costs matter. So intelligent investors will use low-cost index funds to build a diversified portfolio of stocks and bonds, and they will stay the course. And they won't be foolish enough to think that they can consistently outsmart the market.

I was lucky enough to be born in a time and place where society values my talent, and gave me a good education to develop that talent, and set up the laws and the finanical system to let me do what I love doing-and make a lot of money doing it. The least I can do is help pay for all that.

All lives have equal value. And so you say, 'why do poor children die when other children don't? Why do some people have enough nutrition or reasonable toilets and other people don't?' So those basic needs that, through innovation, actually it's very affordable to bring them...to everyone.

When I was 20 years old, I was living in Ireland, going to school in Cork. There was this girl in my film class that I was kind of flirting with. We had this notebook that we passed back and forth. We would write 10 questions and then pass it back while we were supposedly paying attention.

We invest in undervalued companies that exhibit strong fundamentals, above-market dividend yields and historic earnings growth, which our analysis indicates will persist. Our strategy is to own strong, fundamentally sound companies and to avoid speculative stocks or potential bankruptcies.

The speed at which a business success is recognized, furthermore, is not that important as long as the company's intrinsic value is increasing at a satisfactory rate. In fact, delayed recognition can be an advantage: It may give us the chance to buy more of a good thing at a bargain price.

The great personal fortunes in the country weren't built on a portfolio of fifty companies. They were built by someone who identified one wonderful business. With each investment you make, you should have the courage and the conviction to place at least 10% of your net worth in that stock.

The world is very disparate, in terms of the US using the most energy per person, and then the other rich countries - Europe, Japan, New Zealand - using about half of what we do, and then the world average being about a fifth of what we use, with China just now surpassing the world average.

I have to admit that business-type thoughts do sneak into my head: I hope our customers pay us, I hope this stuff is decent, I hope we get it done on time. The little additions and subtractions that one has to do. Take sales, take costs and try to get that big positive number at the bottom.

Economic medicine that was previously meted out by the cupful has recently been dispensed by the barrel. These once unthinkable dosages will almost certainly bring on unwelcome after-effects. Their precise nature is anyone's guess, though one likely consequence is an onslaught of inflation.

What is worrisome about that is the U.S. standard of living. I think it is very difficult to envision our standard of living being preserved if we are in an economy where all people do is flip hamburgers, wait on people in stores, and sue each other. It’s not much of a basis for an economy.

Oh, I think there are a lot of people who would be buying and selling online today that go up there and they get the information, but then when it comes time to type in their credit card they think twice because they're not sure about how that might get out and what that might mean for them.

I know that historically our foundation has had great relations with all the administrations.[Bill] Clinton administration did a lot of outreach. The greatest rise in U.S. foreign aid was under the [George] Bush administration, that's where we got the AIDS initiative, which is called PEPFAR.

Each of us has a purpose for living beyond our own survival and pleasure. Every individual is like a thread in a beautiful tapestry with a vital contribution to make, not only to the sustenance of life as we know it, but in the creation and development of more beneficial expressions of life.

Over the years, Charlie [Munger, Berkshire Hathaway Vice Chairman] and I have observed many accounting-based frauds of staggering size. Few of the perpetrators have been punished; many have not even been censured. It has been far safer to steal large sums with pen than small sums with a gun.

When Ford sells a car, a dealer isn't allowed to take out the engine and put a different one in. When a newsstand sells the Washington Post, no one can go to the newsstand and pay them to rip out the classified section and put their own classified section in - if they could, they would do so.

In poor countries, we still need better ways to measure the effectiveness of the many government workers providing health services. They are the crucial link bringing tools such as vaccines and education to the people who need them most. How well trained are they? Are they showing up to work?

I agree with people like Richard Dawkins that mankind felt the need for creation myths. Before we really began to understand disease and the weather and things like that, we sought false explanations for them. Now science has filled in some of the realm – not all – that religion used to fill.

I agree with people like Richard Dawkins that mankind felt the need for creation myths. Before we really began to understand disease and the weather and things like that, we sought false explanations for them. Now science has filled in some of the realm - not all - that religion used to fill.

People with leverage have dominance over people with less leverage. In other words, just as humans gained advantages over animals by creating leveraged tools, similarly, humans who use these tools of leverage have more power over humans that do not. Saying it more simply, 'leverage is power'.

Observation over many years has taught us that the chief losses to investors come from the purchase of low-quality securities at times of good business conditions. The purchasers view the good current earnings as equivalent to 'earning power' and assume that prosperity is equivalent to safety.

When I say "an energy miracle," I mean that there will be some form of energy whose 24 hour cost really is competitive with hydrocarbons given, say, 20 years of learning curve. You invent it, then you look at how much its costs go down over the next 20 years, that it really beats hydrocarbons.

The investment business has taught me – increasingly as the years have passed – that people, especially investors (and, I believe, Americans), prefer good news and wishful thinking to bad news; and that there are always vested interests to offer facile, optimistic alternatives to the bad news.

The most common cause of low prices is pessimism - some times pervasive, some times specific to a company or industry. We want to do business in such an environment, not because we like pessimism but because we like the prices it produces. It's optimism that is the enemy of the rational buyer.

If you're a guest [at my $113 million house], you'll be able to call up on screens throughout the house almost any image you like - presidential portraits, reproductions of High Renaissance paintings, pictures of sunsets, airplanes, skiers in the Andes, a rare French stamp, the Beatles in 1965.

I think given all the different imperatives - getting energy to Africa, security of energy, climate change, that we should be spending half as much as we spend on health, which will get you all the way up to $15 billion - the health people don't like it when things get compared to their number.

If you do something that's going to get somebody a job, then they'll be able to pay for their kid's school, and then their kid is going to be a doctor, and then that doctor is going to probably help who knows how many other people, so it's very motivating. Much more fun than going to the beach.

How wonderful it would be if we could help our children and grandchildren to learn thanksgiving at an early age. Thanksgiving opens the doors. It changes a child's personality. A child is resentful, negative, or thankful. Thankful children want to give, they radiate happiness, they draw people.

I have pledged - to you, the rating agencies and myself - to always run Berkshire with more than ample cash. We never want to count on the kindness of strangers in order to meet tomorrow's obligations. When forced to choose, I will not trade even a night's sleep for the chance of extra profits.

I think that both parties should declare the debt limit as a political weapon of mass destruction which can't be used. I mean, it is silly to have a country that has 237 years building up its reputation and then have people threaten to tear it down because they're not getting some other matter.

I'm sitting with six and a half billion dollars we're going to use to close the Mars-Wrigley deal on October 6. I've got to hand over that six and a half billion on October 6. Now, I have to be very careful about who I leave it in between now and then, because they're expecting that he show up.

Eradications are special. Zero is a magic number. You either do what it takes to get to zero and you're glad you did it; or you get close, give up and it goes back to where it was before, in which case you wasted all that credibility, activity, money that could have been applied to other things.

Research shows that there is only half as much variation in student achievement between schools as there is among classrooms in the same school. If you want your child to get the best education possible, it is actually more important to get him assigned to a great teacher than to a great school.

I have no quarrel with what I learned in the Presbyterian church - I am still an enthusiastic Christian. But why shouldn't I try to learn more? Why shouldn't I go to Hindu services? Why shouldn't I go to Muslim services? If you are not egotistical, you will welcome the opportunity to learn more.

My view is that the U.S. market will eventually join the emerging markets on the downside because if you take a bearish view about emerging economies, you cannot be too optimistic about the U.S. because for many U.S. corporations, 50 percent or more of their profits come from emerging economies.

I didn't understand the culture and what Starbucks was really about. It wasn't a coffee shop. It was really a way of life... we suffer from thinking that since we have it in New York, or it won't work in New York, that it won't work some other place. That's a discipline we keep trying to improve.

We have two other countries, Pakistan and Afghanistan - again it's the instability that is a problem there. So over the next several years, we expect to drive the number of [polio] cases back down to zero because that is likely to be the second disease after smallpox that we completely eradicate.

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