Alfred Marshall was an English economist, and was one of the most influential economists of his time. His book Principles of Economics (1890) was the dominant economic textbook in England for many years. It brought the ideas of supply and demand, marginal utility, and costs of production into a coherent whole. He is known as one of the founders of neoclassical economics.

Principles of Economics is a leading political economy or economics textbook of Alfred Marshall (1842–1924), first published in 1890. It was the standard text for generations of economics students. Called his magnum opus, it ran to eight editions by 1920. A ninth (variorum) edition was published in 1961, edited in 2 volumes by C. W. Guillebaud.