Adam Smith's and J.-B. Say's definitions -- Distinction between science, the arts, and ethics -- Social wealth. Triple consequences of scarcity. The fact of value in exchange and of economic theory -- The fact of industry and applied economics. The fact of property and social economics -- The market and competition. The problem of the exchange of two commodities for each other -- Curves of effective demand and effective supply -- Discussion of the solution of the problem of exchange of two commodities for each other -- Utility or want curves. The theorem of maximum satisfaction -- Discussion of demand curves. General formula for the mathematical solution of the problem of exchange of two commodities for each other -- Rareté, or the cause of value in exchange -- The problem of the exchange of several commodities for one another. Theorem of general equilibrium -- General formula of the mathematical solution of the problem of the exchange of several commodities for one another. Law of the determination of the prices of the commodities -- Law of the variation of the prices of the commodities -- Theorem of equivalent redistributions. Choice of a standard of measurement and of a medium of exchange -- Purchase curves and sales curves. Price curves --Exposition and refutation of Adam Smith's and J.-B. Say's doctrines of the origin of value in exchange -- Capital and income. The three services -- Elements and mechanism of production -- The entrepreneur. Business accounting and inventory -- Equations of production -- Solution of the equations of production. Law of the determination of the prices of products and services -- The principle of free competition. Law of the variation of the prices of products and services. Price curves -- Gross and net income. The rate of net income. The excess of income over consumption -- Equations of capital formation and credit -- Solution of the equations of capital formation and credit. Law of the determination of the rate of net income -- Theorem of the maximum utility of new capital goods. Law of the variation of the rate of net income -- Laws of the determination and variation of the prices of capital goods. The permanent market -- Increase of the quantity of products. Laws of the general variation of prices in a progressive society -- Critique of the doctrine of the physiocrats -- Exposition and refutation of the English theory of the prices of products -- Exposition and refutation of the English theory of rent -- Exposition and refutation of the English theories of wages and interest -- The problem of the value of money -- Mathematical theory of bimetallism -- Relative stability of the value of the bimetallic standard -- Fiduciary money and offsetting claims. Foreign exchange -- Price fixing and monopoly -- Taxation -- Appendixes: I Geometrical theory of the determination of prices -- II. Observations on the principle of Messrs. Auspitz's and Lieben's theory of prices -- III. Note on Mr. Wicksteed's refutation of the English theory of rent.