Lewis published The Theory of Economic Growth in 1955 in which he sought to “provide an appropriate framework for studying economic development,” driven by a combination of “curiosity and of practical need.”
Lewis offentliggjorde sin bog The Theory of Economic Growth i 1955, hvor han forsøgte at “skabe en passende ramme for at studere økonomisk udvikling,” drevet af en blanding af "nysgerrighed og praktisk nødvendighed".