Two articles published in the Japanese Economic Review (in English) are summarized as recent examples of my studies in the history of economics. A mathematical model based on the quantity theory of money and the labor value theory of money is constructed in “Japanese Studies of Ricardo's Theory of Foreign Trade” (1996), which can justify Kojima's numerical examples (1951) to insist on the determination of the terms of trade in Ricardian theory. “Unequal Exchange and Exploitation” (1998) denies the possibility of exploitation through international trade, which is insisted by Marx and Marxian economists, by the proper comparison of values differently dated.
