Capital is that part of wealth which is devoted to obtaining further wealth. finance
Civilized countries generally adopt gold or silver or both as money. money
Alfred Marshall was one of the most influential economists of his time. His book, Principles of Economics, was the dominant economic textbook in England for many years. It brings 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 economics.