INTRODUCTION Annie Hall is a film with many great moments, and for me the best of them is the movie's single scene with Annie's younger brother, Duane Hall, played by Christopher Walken, the first of his long, brilliant career of cinema weirdos. Visiting the Hall family home, Alvy Singer--that's Woody Allen--bumps into Duane, who immediately shares a fantasy: "Sometimes when I'm driving … on the road at night … I see two headlights coming toward me. Fast. I have this sudden impulse to turn the wheel quickly, head-on into the oncoming car. I can anticipate the explosion. The sound of shattering glass. The … flames rising out of the flowing gasoline." It's Alvy's reply which makes the scene: "Right. Well, I have to--I have to go now, Duane, because I, I'm due back on the planet Earth." I've never shared Duane Hall's wish to turn across the road into the oncoming headlights. I have to admit, though, that I have sometimes had a not-too-distant thought. It's a thought which never hits me in town, or in traffic, or when there's anyone else in the car, but when I'm on my own in the country, zooming down an empty road, with the radio on, and everything is moving free and clear, as it hardly ever is with today's traffic, but when it is, I sometimes have a fleeting thought, one I've never acted on and hope I never will. The thought is this: what would happen if I chose this moment to put the car into reverse? When you ask car buffs that, the first thing they do is to give you a funny look. Then they give you another funny look. Then they explain that what would happen is that the car's engine would basically explode: bits of it would burst through other bits, rods would fly through the air, the carburetor would burst into fragments, there would be incredible noise and smell and smoke, and you would swerve off the road and crash with the certainty of serious injury and the high probability of death. These explanations are sufficiently convincing that I find that the thought of putting the car into reverse flits across my mind only very temporarily, for about half a second at a time, say once every two or three years. I'm sure it's something I'll never do. For the first years of the new millennium, the whole planet was zooming along, doing the equivalent of seventy on a clear road on a sunny day. Between 2000 and 2006, public discourse in the Western world was dominated by the election of George W. Bush, the attacks of 9/11, the "global war on terror" and the wars in Afghanistan and Iraq. But while all that was happening, something momentous was taking place, not quite unnoticed but with bizarrely little notice: the world's wealth was almost doubling. In 2000, the total GDP of Earth--the sum total of all the economic activity on the planet--was $36 trillion.* By the end of 2006, it was $70 trillion. In the developed world, so much attention was given to the bust in dot-com shares in 2000--"the greatest destruction of capital in the history of the world," as it was called at the time--that no one noticed the way the Western economies bounced back. The stock market was relatively stagnant, for reasons I'll go into later, but other sectors of the economy were booming. So was the rest of the planet. An editorial in The Economist in 1999 pointed out that the price of oil was now down to $10 a barrel, and issued a solemn warning: it might not stay there: there were reasons for thinking the price of oil might go to $5 a barrel. Ha! By July 2008 the price of oil had risen to $147.70 a barrel, and as a result the oil-producing countries were awash with cash. From the Arab world to Russia to Venezuela, the treasury departments of all oil-producing countries resembled the scene in The Simpsons in which Monty Burns and his assistant, Smithers, pick up wads of cash and throw them at each other while shouting "Money fight!" The demand for oil was so avid because large sections of the developing world, especially India and China, were undergoing unprecedented levels of economic growth. Both countries suddenly had a hugely expanding, highly consuming new middle class. China's GDP was averaging growth of 10.8 percent a year, India's 8.9 percent. In fifteen years, India's middle class, using a broad definition of the term meaning the section of the population who had escaped from poverty, grew from 147 million to 264 million; China's went from 174 million to 806 million, arguably the greatest economic achievement anywhere on Earth, ever. Chinese personal income grew by 6.6 percent a year from 1978 to 2004, four times as fast as the world average. Thirty million Chinese children are taking piano lessons. Two-fifths of all Indian secondary school boys have regular after-school tuition. When you have two and a quarter billion people living in countries whose economies are booming in that way, you are living on a planet with a whole new economic outlook. Hundreds of millions of people are measurably richer and have new expectations to match. So oil is up, manufacturing is up, the price of commodities--the stuff which goes to make stuff--is up, the economy of (almost) the entire planet is booming. Who knows, optimists think, with the global economy growing at this rate, we can perhaps begin to think seriously about meeting the United Nations' Millennium Development goals, such as halving the number of hungry people, and of people whose income is less than $1 a day, by 2015.1 That seemed utopian at the time the goals were set, but with the world $34 trillion richer, it suddenly looked as if this unprecedented target might be achieved. And then it was as if the global economy went out one day and decided it was zooming along so well, there'd never be a better moment to try that thing of putting the car into reverse. The result … well, out of what seemed to most people a clear blue sky, the clearest blue sky ever, there was a colossal wreck. That left an awful lot of people wondering one simple thing: what happened? I've been following the economic crisis for more than two years now. I began working on the subject as part of the background to a novel, and soon realized that I had stumbled across the most interesting story I've ever found. While I was beginning to work on it, the British bank Northern Rock blew up, and it became clear that, as I wrote at the time, "If our laws are not extended to control the new kinds of super-powerful, super-complex, and potentially super-risky investment vehicles, they will one day cause a financial disaster of global-systemic proportions." I also wrote, apropos the obvious bubble in property prices, that "you would be forgiven for thinking that some sort of crash is imminent." I was both right and too late, because all the groundwork for the crisis had already been done--though the sluggishness of the world's governments, in not preparing for the great unraveling of autumn 2008, was then and still is stupefying. But this is the first reason why I wrote this book: because what's happened is extraordinarily interesting. It is an absolutely amazing story, full of human interest and drama, one whose byways of mathematics, economics, and psychology are both central to the story of the last decades and mysteriously unknown to the general public. We have heard a lot about "the two cultures" of science and the arts--we heard a particularly large amount about it in 2009, because it was the fiftieth anniversary of the speech during which C. P. Snow first used the phrase. But I'm not sure the idea of a huge gap between science and the arts is as true as it was half a century ago--it's certainly true, for instance, that a general reader who wants to pick up an education in the fundamentals of science will find it easier than ever before. It seems to me that there is a much bigger gap between the world of finance and that of the general public and that there is a need to narrow that gap, if the financial industry is not to be a kind of priesthood, administering to its own mysteries and feared and resented by the rest of us. Many bright, literate people have no idea about all sorts of economic basics, of a type that financial insiders take as elementary facts of how the world works. I am an outsider to finance and economics, and my hope is that I can talk across that gulf. My need to understand is the same as yours, whoever you are. That's one of the strangest ironies of this story: after decades in which the ideology of the Western world was personally and economically individualistic, we've suddenly been hit by a crisis which shows in the starkest terms that whether we like it or not--and there are large parts of it that you would have to be crazy to like--we're all in this together. The aftermath of the crisis is going to dominate the economics and politics of our societies for at least a decade to come and perhaps longer. It's important that we try to understand it and begin to think about what's next. * GDP, which will be mentioned quite a few times in this story, sounds complicated but isn't: it's nothing more than the value of all the goods and services produced in an economy. GDP per capita, measuring each individual's piece of the country's pie, is the standard measure of prosperity. © 2010 John Lanchester Excerpted from I. O. U.: Why Everyone Owes Everyone and No One Can Pay by John Lanchester All rights reserved by the original copyright owners. Excerpts are provided for display purposes only and may not be reproduced, reprinted or distributed without the written permission of the publisher.