The article explores different theories of economic growth, comparing old and new models. It discusses how endogenous growth theory can be applied to multi-sector economies and considers factors like income distribution and consumption patterns. The researchers also examine the role of human capital formation and innovation in driving economic growth. Additionally, the article delves into the relationship between competition, technical change, and economic growth. Overall, the study provides a comprehensive overview of various perspectives on economic growth, including the impact of environmental factors and financial intermediation.