Meticulous macroeconomic analysis on the Theory of Growth. The text begins with the acceptance speech of the Nobel Prize, followed by the six original chapters of the first edition. These summarize, with precision, the basic notions of the Theory of Growth. The second half of the book addresses the emergence of a new theoretical current known as "Endogenous Growth Theory," introduced by Paul Romer and Robert Lucas. In addition, Solow includes an essay entitled "Intermezzo" in which he analyzes this transition. The author approaches the AK model of economic growth and redoes his model to help the reader compare the differences within models. The author concludes by outlining some lessons derived from the new growth theory, and pointing out the gaps that must be filled with future research.