These lectures contain a masterful summing-up of Nicholas Kaldor's critique of the foundations of mainstream economic theory. They provide a clear account of his theoretical structures on regional differences, primary producers and manufacturers, and on differing market structures and the likely course of prices and quantities in different markets over time. The first four lectures are concerned with theory, history and explanation; the fifth consists of a detailed set of integrated policy proposals. The book is rounded off with a brilliant biographical essay by Tony Thirlwall.