Development Economics

This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.

In 1954, W. Arthur Lewis, then teaching at the University of Manchester, published a paper modeling a problem no existing economic theory addressed well: an economy split between a traditional subsistence sector, where so much labor was employed that removing some workers cost almost nothing in lost output, and a modern industrial sector that could draw on that surplus labor at a roughly constant wage. As industry expanded and reinvested its profits, it would keep absorbing labor from the traditional sector until the surplus was exhausted and wages began to rise.

The dual-sector model gave newly independent governments across Africa, Asia and the Caribbean, most of them facing exactly this structure, a formal framework for thinking about industrialization rather than a set of borrowed assumptions from already-industrialized Britain or the United States. Lewis, born in Saint Lucia in the British West Indies, brought direct experience of colonial economic administration to the theory and went on to advise the governments of Ghana and several other states.

Later development economists, including Amartya Sen, pushed back against reducing development to capital accumulation and wage convergence alone, arguing that capabilities, health, education, freedom, mattered as much as income. But Lewis's model remains the field's founding formal statement, the reason development economics has its own textbooks rather than being taught as a footnote to growth theory, and the achievement that made him, in 1979, the first economist of African descent to win a Nobel Memorial Prize in Economic Sciences.

This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.

Development economics did not emerge in a vacuum. It emerged in the two decades after 1945, as dozens of colonies became independent states whose economies had been built, under colonial administration, to export raw commodities rather than to industrialize or meet domestic needs. The theoretical toolkit available to their new governments, classical trade theory built around already-industrial Britain, Keynesian demand management built around an economy with deep capital markets and a modern financial system, did not fit.

Economists including Lewis, Paul Rosenstein-Rodan and Ragnar Nurkse argued in the 1940s and 1950s that poor economies faced coordination problems rich ones had already solved: a factory needs workers with purchasing power to buy what it makes, but workers only have purchasing power once factories are hiring them, a chicken-and-egg problem Rosenstein-Rodan called the case for a 'big push' of coordinated, simultaneous industrial investment rather than one project at a time.

The institutions this thinking produced, national five-year plans, state development banks, and eventually dedicated multilateral lenders including the Asian Development Bank and the reoriented World Bank, treated development as something a government could deliberately engineer rather than something that simply happened as a byproduct of free trade. UNCTAD, founded in 1964, gave that position an institutional home inside the United Nations itself, arguing that the postwar trading system's own rules needed rebalancing before free trade could actually deliver the convergence classical theory promised.