Robert Solow

Robert Solow (1924–2023) was an American economist who taught at the Massachusetts Institute of Technology (MIT) from 1949, becoming an emeritus professor in 1995. He is widely considered one of the founders of modern macroeconomic growth theory. Solow's intellectual contributions significantly advanced the understanding of how economies grow over time, moving beyond simpler Keynesian models.
His most celebrated contribution is the Solow-Swan model, or the neoclassical growth model, published in "A Contribution to the Theory of Economic Growth" (1956). This model introduced a production function that incorporated capital, labor, and technology as factors of production. A key insight was that while capital accumulation could lead to temporary growth, sustained increases in living standards required technological progress, which Solow initially treated as an exogenous factor. His model provided a rigorous framework for analyzing the sources of economic growth and the dynamics of capital accumulation.
Using empirical data, Solow later attempted to quantify the contributions of different factors to U.S. economic growth, famously finding in a 1957 study that about 80% of the growth in per capita output in the U.S. between 1909 and 1949 could be attributed to technological progress (the "Solow residual"), rather than increases in capital or labor. This finding spurred extensive research into the nature and determinants of technological change.
For his contributions to growth theory, Solow was awarded the Nobel Memorial Prize in Economic Sciences in 1987. His work laid the theoretical foundation for much of subsequent macroeconomic research, including endogenous growth theory, which sought to explain technology as an internal part of the economic system. Solow also served on the Council of Economic Advisers from 1961 to 1962 and advised several presidential administrations.