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“The most valuable of all capital is that invested in human beings”Principles of Economics by Alfred Marshal is a foundational text that continues to shape our understanding of economic theory. First published in 1890, Marshall's magnum opus revolutionised the field by compiling key concepts such as supply and demand, marginal utility, cost of production and distribution, which became the cornerstones of contemporary microeconomics and continue to influence modern business strategy. Inspiring generations of economists and students alike, the book remains as relevant today as it was over a century ago, acting as an indispensable guide for those seeking a profound understanding of the principles that govern our economic world.