About the Book: This book discusses the evolution of economic thought from the Keynesian School of Economics in response to the Great Depression, emphasizing the shift from classical principles. It underscores the role of fiscal policy, particularly public expenditure, in achieving macroeconomic goals. The focus is on the classification of public expenditure, its importance in policy formulation, and its theoretical relationship with economic growth. This book introduces a research study in India examining the causal relationship between public expenditure and economic growth, employing the Engel-Granger approach. The book is structured into six chapters, covering topics such as theoretical perspectives, classification of public expenditure in India, trends in public expenditure, and empirical analysis of its relationship with economic growth. The book summarizes findings, discusses policy implications, and suggests avenues for future research