In this fourth part of our series on economic growth and development, I outline the major theories of economic development developed over the past sixty years. I trace the development of such theories beginning with the Harrod-Domar theory, and proceeding through the Solow-Swan model, the Ramsey model, Romer's spillovers model, and endogenous growth theory, in each case discussing their key features, and analysing their strengths and weaknesses. The episode concludes with a brief survey of a range of more recent growth models focusing on modelling coordination failures and poverty traps, emphasising the work of Daron Acemoglu on economic institutions. The Recommended pre-listening is Episode 105: Economic Growth and Development Part III.

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