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Sir William Arthur Lewis was an economist who created the "dual-sector model" detailing how growth differed in rich and poor economies. His theory became the backbone of international development economics.

  • He was the first black student ever to gain entry to the London School of Economics and became the first economic adviser to the newly independent nation of Ghana, helping to draw up its first-ever five-year development plan in consultation with President Kwame Nkrumah.
  • Lewis, a dual citizen of Saint Lucia and Britain, was knighted in 1963 and won the Nobel Prize in economics in 1979.