Books that propound theories of history -- that is, that claim to find common patterns in events widely separated in time and space -- have a deservedly dicey reputation among the professionals. When such books are good they can be very good: a classic like William McNeill's Plagues and Peoples can permanently change the way you look at human affairs. Most big-think books about history, however, turn out to offer little more than strained analogies mixed with pretentious restatements of the obvious. A few have been downright pernicious.

Still, the public has an understandably hearty appetite for theories that seem to explain it all, and so they keep on coming. The Great Wave: Price Revolutions and the Rhythm of History, by David Hackett Fischer, a professor of history at Brandeis University, has already generated considerable buzz. Remarkably for a book that spends most of its 500-plus pages dwelling on events centuries (and occasionally millennia) in the past, a good deal of the buzz comes from the business community, not usually noted for its interest in history. Indeed, Fischer is getting favorable mention from people who tell us in the next breath that we live in a "new economy" to which old rules no longer apply.

There is a reason for this peculiar affinity between a historian with an eighth-century perspective and business commentators obsessed with the new; what these pundits really want, it turns out, is to use his account of alleged patterns in the distant past as an excuse to ignore the lessons of more recent history.

On its face, Fischer's book looks promising. Inflation is a plausible candidate for a wide-ranging search for parallels and common principles. And the book starts well, with an eloquent and stirring defense of the role of quantification in history (although my favorite along these lines is still Colin McEvedy's introduction to The Penguin Atlas of Ancient History, which contains this immortal sentence: "History being a branch of the biological sciences, its ultimate expression must be mathematical"). I plan to keep The Great Wave on my shelf both as a useful source of facts and figures and as a guide to data sources; the author did do a lot of homework.

It is therefore a shame that the book turns out to be quite wrong-headed. But let that not be too harsh a judgment: it is wrong-headed in interesting ways, and much can be learned by examining how and where Fischer went astray.

UNCONVENTIONAL WISDOM?

Fischer starts with an empirical observation: the history of prices in the Western world since the twelfth century can be broadly divided into alternating periods of generally rising prices and of rough price stability. Everyone knows that the twentieth century has been an era of inflation, and the prolonged price rise from 1500 to 1700 is also well known. Fischer makes a good case, however, that there were also reasonably well-defined eras of rising prices in medieval Europe before the Black Death and again in the eighteenth century.

What does conventional economic history have to say about these "price revolutions," as Fischer describes them? Well, the two familiar ones are generally attributed to increases in the supply of money, but with those increases themselves driven by very different factors. The long inflation from 1500 to 1700 is mainly attributed to the flood of silver from Spain's New World conquests; in the modern world governments can print money instead of mining it, and have done so repeatedly both to pay their bills and, more creditably, in an attempt to trade off higher prices for lower unemployment.

Fischer regards such explanations as inadequate. He insists both that inflation is only one symptom of a deeper process -- a process that also produces growing population, rising inequality, declining real wages, and ultimately a crisis -- and that this process is repetitive, that in a qualitative sense all price revolutions are alike. In particular, the travails of the West in recent decades are typical of the endgame of a price revolution -- and we can take comfort in the fact that such difficult periods are inevitably followed by a prolonged "equilibrium."

This thesis is fun to contemplate and comforting in its implication that the worst may already be behind us. So what is wrong with it? One problem with The Great Wave is that Fischer displays a shortcoming common among historians writing on economic matters: he would clearly rather spend a year hunting down facts than a day mastering a theory, even if only to learn enough to reject it. As a result, his accounts of what he imagines to be the conventional theories of inflation -- theories that he claims to refute with his evidence -- are wildly off base, sometimes ludicrously so.

For example, at the very beginning of the book Fischer unwittingly reveals his unfamiliarity with even the most basic monetary economics when he attributes to Princeton's Alan Blinder the dictum that inflation is "always and everywhere a monetary phenomenon" -- not realizing that when Blinder used the phrase in a newspaper article he was quoting Milton Friedman. Now Friedman's dictum, love it or hate it, is one of the three or four most famous tag lines in economics, right up there with "The division of labor is limited by the extent of the market" and "In the long run we are all dead." It is as if the author of a seemingly authoritative book about epistemology were to attribute the line "I think, therefore I am" to a modern philosopher who used it in an op-ed piece.

Fischer's impatience with analytical thinking extends to his own ideas; the book contains quite a few whoppers, assertions that fall apart if given even a moment's serious thought. His discussion of the origins of the great price rise after 1500 provides an illuminating example. Fischer points out, correctly, that prices in Europe began rising well before New World silver began to arrive -- which, he argues, refutes any monetarist explanation. There is no mystery here: as he admits, there was a surge in European silver production in the late fifteenth century, mainly from mines in Bohemia and what is now southern Germany. (Coins stamped at one of those mines, in Joachimsthal, were circulated so widely that "thaler" became a generic phrase for any silver coin -- and eventually, with some slippage in spelling and pronunciation, for pieces of green paper bearing George Washington's portrait.) But Fischer insists, without evidence, that the rise in European silver production was a result rather than a cause of inflation -- that mines were opened and expanded to meet the "desperate need for liquidity" produced by rising prices.

Think about that for a minute. We can be sure that fifteenth-century German mine owners neither knew nor cared about Europe's need for liquidity -- they were simply trying to make a profit. Now ask yourself: does inflation (a rise in the price of goods and services in terms of silver) make it more or less profitable to open a silver mine? The clear answer is that it makes the mine less profitable: a pound of silver extracted from the mine would buy fewer goods and services than before. Had Fischer devoted even a few minutes to thinking his story through, he would have realized this. Yet the claim that rising prices necessarily induce increased creation of money is crucial to his whole theory.

THE REAL REVOLUTION

There is, however, an even bigger problem with The Great Wave. Like most efforts to derive lessons for the present from the broad sweep of history, Fischer's thesis essentially involves denying that the Industrial Revolution led to any fundamental change in the way the world works. But the fact is that beginning in the eighteenth century there was a qualitative change in the nature not only of economic life but of human society in general, a change more profound than any since the rise of civilization itself. That does not mean we have nothing to learn from earlier centuries. It does mean we have to be very careful in drawing parallels.

There are many ways in which the pre-industrial world was another planet from the one we now inhabit, but in this context two changes are particularly crucial. First, for 55 out of the last 57 centuries Malthus was right. What I mean is that for almost the entire history of civilization, improvements in technology did not lead to sustained increases in living standards; instead, the gains were dissipated by rising population, with pressure on resources eventually driving the condition of the masses back to roughly its previous level. The subjects of Louis XIV were not noticeably better nourished than those of ancient Sumerian city-states. While they had enough to survive and raise children in good times, they lived sufficiently close to the edge that the Four Horsemen could carry them off now and then, keeping the population more or less stable.

It has been Malthus' great misfortune that the power of his theory to explain what happened in most of recorded history has been obscured by the fact that the only two centuries for which it does not work happen to be the two centuries that followed its publication. But this was, of course, not an accident. Malthus was a man of his time, and his musings were only one symptom of the rise of a rationalist, scientific outlook; another symptom of that rise was the Industrial Revolution.

Because Malthus was right, however, the great waves of economic activity in the pre-industrial world were driven by forces that have little relevance to more recent fluctuations. In particular, the most important discipline for understanding long swings in pre-industrial population and real wages is not macroeconomics but microbe economics. Now and then devastating new diseases would appear (often, as McNeill showed in Plagues and Peoples, as a result of conquests or the opening of new trade routes, both of which tended to bring formerly separated populations, and the germs they harbored, into contact). Initially the population would plunge and real wages would soar. As microbes and humans co-evolved into a new equilibrium, population and pressure on resources would rise again, and the increasingly malnourished masses would become vulnerable to the next plague. All this is fascinating, but of questionable relevance to 21st century economic prospects.

The other great change is the invention of the business cycle. Economic instability has always been with us. But economic downturns before 1800 were the result of supply-side events like crop failures and wars. They bore little resemblance to modern recessions, which are the result of slumps in monetary demand. To have a recession as we understand it today, there must be a structure of paper credit erected on top of or in place of the circulation of gold and silver -- otherwise, the credit contraction central to the phenomenon cannot get started. And a substantial part of the economy must also be likely to respond to slumping demand by cutting production rather than prices -- otherwise a financial contraction will lead to deflation, but not to an actual decline in output. Pre-industrial economies could not have recessions as we know them, both because of the simplicity of their monetary systems and because they consisted mostly of farmers, who respond to a drop in demand mainly by cutting prices rather than by growing less.

Economic historians generally think that the first true recession was the slump that hit England after the end of the Napoleonic Wars -- in other words, the first recession occurred, as one would expect, in the first industrial nation. Nations that industrialized later also had to wait for their chance to share the recession experience. My colleague, the economic historian Peter Temin, tells me that the United States did not experience a true recession until the panic of 1873. Moreover, he has produced evidence that between 1820 and 1860 there was a clear difference in the behavior of the American and British economies: America was still a "classical" economy in which financial contractions might reduce prices but had little effect on growth, while England was already beginning to look recognizably Keynesian.

NEW ECONOMIES, NEW DIFFICULTIES

All that brings us to the reason people in the business community think that Fischer's book is relevant to current events, as well as to the reason for its actual irrelevance. Anyone who reads the business press knows that the mood these days is one of "what, me worry?" optimism. After six years of fairly steady growth with surprisingly quiescent inflation, every major newspaper and magazine has either suggested or flatly declared that the business cycle is dead -- that the recession of 1990-91 was the last such slump we will see for many years to come.

Naysayers like me try to puncture this serenity by insisting that it ignores the lessons of history. It was not that long ago that George Bush got the boot because of the economy, stupid. We had a truly vicious recession in the early 1980s, and for that matter, Mexico, Japan, and even Canada (remember that country next to us?) can attest that the 1990s have by no means been always and everywhere as placid as the last few years in the United States. Moreover, we've been here before: near the end of another long recovery, in the late 1960s, pronouncements that the business cycle was dead were just as prevalent as they are today.

Why does the business cycle persist? Because, as the bumper stickers don't quite say, stuff happens: the world refuses to stay put, and policy is always playing catch-up. To look at the causes of booms and slumps since the business cycle was last declared dead is to be awed by the sheer variety of curve balls history throws at us. Who in 1969 imagined that a recession could be triggered by a war in the Middle East -- let alone a fundamentalist revolution in Iran? Who would have thought that the ever-so-controlled Japanese economy could be whipsawed by a financial bubble that drove land and stock prices to ridiculous levels, then burst? Who could have predicted that two well-meaning projects -- the political unification of Germany and the monetary unification of Europe -- would interact to produce a disastrous slump? True, we learn from experience: the stock market crash of 1987 didn't play like that of 1929, because this time around Alan Greenspan, chairman of the Federal Reserve, knew what to do. But as fast as we learn to cope with old sources of boom and slump, new sources emerge.

Some people tell us that the forces that used to drive many recessions have abated: we are no longer as much of a manufacturing economy, inventories have become less of an "accelerator" of slumps, and so on. And they are surely right: we will not have the same problems in the future that we had in the past. We will have different problems. And because the problems are new, we will handle them badly, and the business cycle will endure.

But this is not a message business pundits want to hear, and for them Fischer's book is the perfect answer. Of course, they can now say, the business cycle has been with us for the last 150 years -- but the long view tells us that while instability is the norm while you are passing through a price revolution, it is smooth sailing once you're through the crisis and reach the new "equilibrium." And guess what: we have just arrived at the Promised Land.

But the modern business cycle bears no more resemblance to the economic fluctuations that afflicted pre-industrial Europe than NATO does to the Holy Roman Empire. It may be tempting to ignore the very real lessons of the last century because of some alleged parallels with the distant past. To do so, however, would be to use history not as a guide to the present, but merely as an excuse for some very ahistorical wishful thinking.

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