sentences:  Marshall began writing the "Principles of Economics" in 1881 and he spent much of the next decade at work on the treatise.His plan for the work gradually extended to a two-volume compilation on the whole of economic thought; the first volume was published in 1890 to worldwide acclaim that established him as one of the leading economists of his time.The second volume, which was to address foreign trade, money, trade fluctuations, taxation, and collectivism, was never published at all.