The book seeks to analyse Ricardo's works from the year 1920 to the end of the 1930s - during the time of the outbreak of the Second World War, when even the study of classical economics became difficult. The book covers different aspects of his works and contains elements which may be interesting to foreign and even Japanese readers today without necessarily coming under the influence of Marx's reading. It presents Ricardo's work that is at present, wholly unknown to the Ricardo scholars and more generally to the historians of economic thought outside Japan.