The dangers of living in a zero-sum world economy

We live in a positive-sum world economy and have done so for about two centuries. This, I believe, is why democracy has become a political norm, empires have largely vanished, legal slavery and serfdom have disappeared and measures of well-being have risen almost everywhere. What then do I mean by a positive-sum economy? It is one in which everybody can become better off. It is one in which real incomes per head are able to rise indefinitely.

How long might such a world last, and what might happen if it ends? The debate on the connected issues of climate change and energy security raises these absolutely central questions. As I argued in a previous column (“Welcome to a world of runaway energy demand”, November 14, 2007), fossilised sunlight and ideas have been the twin drivers of the world economy. So nothing less is at stake than the world we inhabit, by which I mean its political and economic, as well as physical, nature.


According to Angus Maddison, the economic historian, humanity’s average real income per head has risen 10-fold since 1820.* Increases have also occurred almost everywhere, albeit to hugely divergent extents: US incomes per head have risen 23-fold and those of Africa merely four-fold. Moreover, huge improvements have happened, despite a more than six-fold increase in the world’s population.

It is an astonishing story with hugely desirable consequences. Clever use of commercial energy has immeasurably increased the range of goods and services available. It has also substantially reduced both our own drudgery and our dependence on that of others. Serfs and slaves need no longer satisfy the appetites of narrow elites. Women need no longer devote their lives to the demands of domesticity. Consistent rises in real incomes per head have transformed our economic lives.

What is less widely understood is that they have also transformed politics. A zero-sum economy leads, inevitably, to repression at home and plunder abroad. In traditional agrarian societies the surpluses extracted from the vast majority of peasants supported the relatively luxurious lifestyles of military, bureaucratic and noble elites. The only way to increase the prosperity of an entire people was to steal from another one. Some peoples made almost a business out of such plunder: the Roman republic was one example; the nomads of the Eurasian steppes, who reached their apogee of success under Genghis Khan and his successors, were another. The European conquerors of the 16th to 18th centuries were, arguably, a third. In a world of stagnant living standards the gains of one group came at the expense of equal, if not still bigger, losses for others. This, then, was a world of savage repression and brutal predation.

Financial Times

(If that link doesn’t work, read it here.)