https://www.mises.ch/library/Mises_TheoryOfMoney&Credit.pdf
This classic treatise on monetary theory remains the definitive book on the foundations of monetary theory, and the first really great integration of microeconomics and macroeconomics. As Rothbard points out in his introduction to "the best book on money ever written," economists have yet to absorb all its lessons.
Mises shows how money had its origin in the market, and how its value is based on its usefulness as a commodity in exchange. In a step-by-step manner, Mises presents the case for sound money with no inflation, and presents the beginnings of a full-scale business cycle theory. This edition includes Mises's early blueprint, improved later in life, for a return to a fully backed gold standard and competitive banking.