The Takeoff

Britain's industrial takeoff was a prolonged change in the economy's capacity to keep improving. The familiar date of 1800 gives a hinge to a history that moved through workshops, mines, mills and markets at very different speeds. Earlier societies had known invention, expanding trade and periods of rising prosperity; the problem is to explain how improvement became more persistent and more widely productive. Even the great emblem of the change arrived slowly. Nicholas Crafts's reconstruction places steam's largest contribution to British productivity growth well into the nineteenth century, after the first famous engines. The invention had to become economical, reliable and useful across enough activities to move the national total. A drawing of the takeoff can compress those decades into an elbow. Explaining it requires recovering the decisions and connections concealed inside the bend, including why a particular machine was worth building in a particular place.¹

One explanation of Britain's lead begins with the prices an inventor could hope to change. Robert Allen argues that relatively expensive labor and cheap energy made equipment that saved workers while using more capital and fuel especially attractive in Britain. In his account, these conditions themselves had a history: commercial expansion and urban demand, the development of coal supply, and an overseas trading system sustained by empire, naval power and restrictions on competing traders. The argument gives geography and commerce a route into the workshop's calculation. A coal deposit matters through the cost of obtaining and using its energy; a market matters through the sales that can repay development. Allen's explanation therefore asks us to compare the same technical possibility under different economic conditions. It offers a reason for the direction of inventive effort, without making ingenuity the exclusive possession of the people who first found a particular design profitable.²

A hypothetical workshop makes that price comparison visible. Suppose its established method needs ten workers, while a new machine needs four, plus an annual equipment cost of thirty and a fuel bill of ten. At a wage of ten, the old method costs one hundred and the machine method eighty. The saving is twenty. Now place the same machine where the wage is three and fuel costs twenty. The old method costs thirty; the new one costs sixty-two. A technically workable machine would more than double the bill. The difference can affect both adoption and the willingness to pay for experiments that might produce the machine. It can also disappear. If improvements cut the annual equipment charge to ten and the fuel bill to four, the second workshop's machine method costs twenty-six and becomes worth adopting. A design can acquire a larger world as its own requirements change.³

Profitable possibilities also require a way to discover, test and transmit workable knowledge. Joel Mokyr places that process at the center of his explanation of sustained modern growth. His Industrial Enlightenment joins the ambition to improve material life with easier access to knowledge that producers can use. The relevant knowledge includes measured properties, practical experience and descriptions of techniques as well as scientific theory. A maker who learns why a device works can search more intelligently for its defects and adapt it to a different task. A maker who learns what others have already tried can avoid purchasing the same failure again. This account gives continuity to invention: one success enlarges the resources available for the next. Its geographical scale also differs from a purely British explanation, because knowledge circulated across a wider European community. Britain's early industrial lead and the persistence of technological progress are related questions with different things to explain.⁴

The first profitable machine leaves a second problem: making improvement survive its first success. Our workshop saves twenty under the initial favorable prices, but those savings alone tell us nothing about the next design. They might finance experiments, be consumed, or disappear when a competitor cuts the selling price. Sustained advance requires further opportunities and some means of pursuing them. A larger market can spread a development cost over more sales; access to other makers can supply a missing technique; reliable parts and repair can turn an intermittent experiment into ordinary production. These channels can reinforce one another. They also create bottlenecks, since cheap power does little for a machine that cannot be built accurately, and a perfect design does little for a buyer unable to finance it. The historical task is to show which connections operated, when they became effective, and where they continued to fail.

The escape must finally be measured per person, which makes population part of the question without turning it into a mechanical veto. If total output rises by a fifth while population rises by a tenth, output per head rises by about nine percent. If both rise by a fifth, output per head is unchanged. These two cases can begin with the same inventions and end with different living standards because production and population have changed at different rates. The earlier Takeoff linked industrialization to the demographic transition; that connection opens a further history of births, deaths and household decisions. Falling fertility is not an arithmetic prerequisite for rising income per person. Nor does a rising national average tell us how the gain reaches a particular family. To understand the escape, one must follow the growth of productive capacity through the population it supports and the distribution through which people receive its benefits.⁵

The takeoff joins a local beginning to a continuing process whose reach became much larger than its birthplace. Britain's prices could reward particular machines; the means of developing and sharing knowledge could improve them; the expansion of their uses could carry productivity beyond the first workshops. None of those statements makes the precise date inevitable. Each names a relationship that historical evidence must establish, and leaves room for decisions, conflicts and accidents that altered the course. The achievement to explain is cumulative: a generation could inherit productive possibilities its predecessors had helped enlarge, then enlarge them again. That inheritance gives the long curve its force. The machines visible at the bend were part of it, together with the ability to construct, finance, operate and improve them. The next plates separate those contributions so that the word growth can begin to disclose how the accumulation worked.