Here’s Part 1 of (what I think are) the highlights from the 2015 Shareholder Letter.

On math:

Some commentators bemoan our current 2% per year growth in real GDP – and, yes, we would all like to see a higher rate. But let’s do some simple math using the much-lamented 2% figure. That rate, we will see, delivers astounding gains.

America’s population is growing about .8% per year (.5% from births minus deaths and .3% from net migration). Thus 2% of overall growth produces about 1.2% of per capita growth. That may not sound impressive. But in a single generation of, say, 25 years, that rate of growth leads to a gain of 34.4% in real GDP per capita. (Compounding’s effects produce the excess over the percentage that would result by simply multiplying 25 x 1.2%.) In turn, that 34.4% gain will produce a staggering $19,000 increase in real GDP per capita for the next generation. Were that to be distributed equally, the gain would be $76,000 annually for a family of four. Today’s politicians need not shed tears for tomorrow’s children.

On inequality:

All families in my upper middle-class neighborhood regularly enjoy a living standard better than that achieved by John D. Rockefeller Sr. at the time of my birth. His unparalleled fortune couldn’t buy what we now take for granted, whether the field is – to name just a few – transportation, entertainment, communication or medical services. Rockefeller certainly had power and fame; he could not, however, live as well as my neighbors now do.

Though the pie to be shared by the next generation will be far larger than today’s, how it will be divided will remain fiercely contentious. Just as is now the case, there will be struggles for the increased output of goods and services between those people in their productive years and retirees, between the healthy and the infirm, between the inheritors and the Horatio Algers, between investors and workers and, in particular, between those with talents that are valued highly by the marketplace and the equally decent hard-working Americans who lack the skills the market prizes. Clashes of that sort have forever been with us – and will forever continue. Congress will be the battlefield; money and votes will be the weapons. Lobbying will remain a growth industry.

On Tinder:

…even members of the “losing” sides will almost certainly enjoy – as they should – far more goods and services in the future than they have in the past. The quality of their increased bounty will also dramatically improve. Nothing rivals the market system in producing what people want – nor, even more so, in delivering what people don’t yet know they want. My parents, when young, could not envision a television set, nor did I, in my 50s, think I needed a personal computer. Both products, once people saw what they could do, quickly revolutionized their lives. I now spend ten hours a week playing bridge online. And, as I write this letter, “search” is invaluable to me. (I’m not ready for Tinder, however.)

On the link between productivity and prosperity:

In 1900, America’s civilian work force numbered 28 million. Of these, 11 million, a staggering 40% of the total, worked in farming. The leading crop then, as now, was corn. About 90 million acres were devoted to its production and the yield per acre was 30 bushels, for a total output of 2.7 billion bushels annually.

Then came the tractor and one innovation after another that revolutionized such keys to farm productivity as planting, harvesting, irrigation, fertilization and seed quality. Today, we devote about 85 million acres to corn. Productivity, however, has improved yields to more than 150 bushels per acre, for an annual output of 13-14 billion bushels. Farmers have made similar gains with other products.

Increased yields, though, are only half the story: The huge increases in physical output have been accompanied by a dramatic reduction in the number of farm laborers (“human input”). Today about three million people work on farms, a tiny 2% of our 158-million-person work force. Thus, improved farming methods have allowed tens of millions of present-day workers to utilize their time and talents in other endeavors, a reallocation of human resources that enables Americans of today to enjoy huge quantities of non-farm goods and services they would otherwise lack.

It’s easy to look back over the 115-year span and realize how extraordinarily beneficial agricultural innovations have been – not just for farmers but, more broadly, for our entire society. We would not have anything close to the America we now know had we stifled those improvements in productivity. (It was fortunate that horses couldn’t vote.) On a day-to-day basis, however, talk of the “greater good” must have rung hollow to farm hands who lost their jobs to machines that performed routine tasks far more efficiently than humans ever could.

On the cost of productivity gains:

The productivity gains that I’ve just spelled out – and countless others that have been achieved in America – have delivered awesome benefits to society. That’s the reason our citizens, as a whole, have enjoyed – and will continue to enjoy – major gains in the goods and services they receive.

To this thought there are offsets. First, the productivity gains achieved in recent years have largely benefitted the wealthy. Second, productivity gains frequently cause upheaval: Both capital and labor can pay a terrible price when innovation or new efficiencies upend their worlds.

We need shed no tears for the capitalists (whether they be private owners or an army of public shareholders). It’s their job to take care of themselves. […]

A long-employed worker faces a different equation. When innovation and the market system interact to produce efficiencies, many workers may be rendered unnecessary, their talents obsolete. Some can find decent employment elsewhere; for others, that is not an option. […]

The answer in such disruptions is not the restraining or outlawing of actions that increase productivity. Americans would not be living nearly as well as we do if we had mandated that 11 million people should forever be employed in farming.

The solution, rather, is a variety of safety nets aimed at providing a decent life for those who are willing to work but find their specific talents judged of small value because of market forces. (I personally favor a reformed and expanded Earned Income Tax Credit that would try to make sure America works for those willing to work.) The price of achieving ever-increasing prosperity for the great majority of Americans should not be penury for the unfortunate.

On Climate Change:

It seems highly likely to me that climate change poses a major problem for the planet. I say “highly likely” rather than “certain” because I have no scientific aptitude and remember well the dire predictions of most “experts” about Y2K. It would be foolish, however, for me or anyone to demand 100% proof of huge forthcoming damage to the world if that outcome seemed at all possible and if prompt action had even a small chance of thwarting the danger.

This issue bears a similarity to Pascal’s Wager on the Existence of God. Pascal, it may be recalled, argued that if there were only a tiny probability that God truly existed, it made sense to behave as if He did because the rewards could be infinite whereas the lack of belief risked eternal misery. Likewise, if there is only a 1% chance the planet is heading toward a truly major disaster and delay means passing a point of no return, inaction now is foolhardy. Call this Noah’s Law: If an ark may be essential for survival, begin building it today, no matter how cloudless the skies appear.

On the End of the World:

There is, however, one clear, present and enduring danger to Berkshire against which Charlie and I are powerless. That threat to Berkshire is also the major threat our citizenry faces: a “successful” (as defined by the aggressor) cyber, biological, nuclear or chemical attack on the United States. That is a risk Berkshire shares with all of American business.

The probability of such mass destruction in any given year is likely very small. It’s been more than 70 years since I delivered a Washington Post newspaper headlining the fact that the United States had dropped the first atomic bomb. Subsequently, we’ve had a few close calls but avoided catastrophic destruction. We can thank our government – and luck! – for this result.

Nevertheless, what’s a small probability in a short period approaches certainty in the longer run. (If there is only one chance in thirty of an event occurring in a given year, the likelihood of it occurring at least once in a century is 96.6%.) The added bad news is that there will forever be people and organizations and perhaps even nations that would like to inflict maximum damage on our country. Their means of doing so have increased exponentially during my lifetime. “Innovation” has its dark side.

There is no way for American corporations or their investors to shed this risk. If an event occurs in the U.S. that leads to mass devastation, the value of all equity investments will almost certainly be decimated.

No one knows what “the day after” will look like. I think, however, that Einstein’s 1949 appraisal remains apt: “I know not with what weapons World War III will be fought, but World War IV will be fought with sticks and stones.”

Rolling Alpha posts about finance, economics, and sometimes stuff that is only quite loosely related. Follow me on Twitter @RollingAlpha, or like my page on Facebook at www.facebook.com/rollingalpha. Or both.