The seventh volume of the Collected Works of Michal Kalecki, one of the twentieth century's preeminent economists, contains his empirical studies of the wartime and post-war economy in Britain and the USA, together with papers on the work of other economists and miscellanea. The first part of the book collects together his articles on the economic conditions of Britain during the Second World War, focusing on the rationing of consumption and war finance, and its post-war reconstructions. These articles are among Kalecki's best known, and contributed significantly to his world renown as an economist. Part two contains studies of post-war America, comparing the economy with the situation before the War. Part three contains a group of articles under the title `Political economy and economists', and includes book reviews and essays on the study of economics. Part four collects essays on a variety of topics, including Polish economic planning, construction engineering, and the theory of numbers. As in previous volumes, editorial notes and annexes by Professor Osiaty'nski provide invaluable background information and explanatory glosses on the main text. Among other things, they reveal details of Kalecki's work for the United Nations. Since this is the final volume of the Collected Works, it concludes with a chronology of biographical information and a complete bibliography of Kalecki's writings from 1927 to 1987.