The Nobel prize goes to Joel Mokyr, the economic historian of the industrial revolution and the growth theorists Phillippe Aghion and Peter Howitt best known for their Schumpeterian model of economic growth.
Here’s a good quote from Nobelist Joel Mokyr’s the Lever of Riches.
Yet the central message of this book is not unequivocally optimistic . History provides us with relatively few examples of societies that were technologically progressive. Our own world is exceptional, though not unique, in this regard. By and large, the forces opposing technological progress have been stronger than those striving for changes. The study of technological progress is therefore a study of exceptionalism, of cases in which as a result of rare circumstances, the normal tendency of societies to slide toward stasis and equilibrium was broken. The unprecedented prosperity enjoyed today by a substantial proportion of humanity stems from accidental factors to a degree greater than is commonly supposed. Moreover, technological progress is like a fragile and vulnerable plant, whose nourishing is not only dependent on the appropriate surroundings and climate, but whose life is almost always short. It is highly sensitive to the social and economic environment and can easily be arrested by relatively small external changes. If there is a lesson to be learned from the history of technology it is that Schumpeterian growth, like the other forms of economic growth, cannot and should not be taken for granted.
Aghion and Howitt’s Schumpeterian model of economic growth shares with Romer the idea that the key factors of economic growth must be modelled, growth is thus endogenous to the model (unlike Solow where growth is primarily driven by technology an unexplained exogenous factor). In Romer’s model, however, growth is primarily horizontally driven by new varieties whereas in Aghion and Howitt growth comes from creative destruction, from new ideas, technologies and firms replacing old ideas, technologies and firms.
Thus, Aghion and Howitt’s model lends itself to micro-data on firm entry and exit of the kind pioneered by Haltiwanger and others (who Tyler and I have argued for a future Nobel). Economic growth is not just about new ideas but about how well an economy can reallocate production to the firms using the new ideas. Consider the picture below, based on data from Bartelsman, Haltiwanger, and Scarpetta. It shows the covariance of labor productivity and firm size. In the United States highly productive firms tend to be big but this is much less true in other economies. In the UK during this period (1993-2001) the covariance of productive and big considerably less than half the rate in the United States. In Romania at this time the covariance was even negative–indicating that the big firms were among the least productive. Why? Well in Romania this as the end of the communist era when big, unproductive government run behemoths dominated the economy. As Romania moved towards markets the covariance between labor productivity and firm size increased. That is the economy became more productive as it reallocated labor from low productivity firms to high productivity firms.
Aghion and Howitt’s work centers on how new ideas emerge and how creative destruction turns those ideas into real economic change through the birth and death of firms. But creative destruction is never painless—growth requires that some firms fail and that labor be displaced so resources can flow to new, more productive uses. Aghion and Howitt will likely point to the United States as dealing with his process better than Europe. Business dynamism has declined in Europe relative to the United States, a worrying fact given that business dynamism has also declined in the United States. Nevertheless, the US has a more flexible labor market and appears more open to both the birth of new firms (venture capital) and the deaths of older firms. Yet, in both the United States and around the the world the differences between high productivity and low productivity firms appears to be growing, that is the dispersion in productivity is growing which means that the good ideas are not spreading as quickly as they once did. Aghion and Howitt’s work gives us a model for thinking about these kinds of issues–see, for example, Ten Facts on Business Dynamism and Lessons from Endogenous Growth Theory.
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