The 'Wealth of Nations' is a foundational text written by Adam Smith in 1776, which outlines the principles of political economy and lays the groundwork for modern capitalism. Smith argues that the wealth of a nation is best achieved through free markets, competition, and individual self-interest, emphasizing the importance of production and trade in generating prosperity. This work is crucial for understanding the economic effects of industrialization, as it highlights how an increase in manufacturing and trade can lead to national growth and increased standards of living.