Pen, J. (Jan) creator text Baltimore Penguin Books 1965 monographic 265 pages illustrations 18 cm. Modern economics is Neo- Keynesian Productive capacity determines national income: The classical theory iii.Total expenditure determines national income: Keynes's theory iv. How do we build a model? v. The impact of national trade vi. The role of the budget vii. Old and new in the theory of money viii. The value of money ix. The wage level in the model x. Economic growth xi. Fitting the Jigsaw together xii Economic steersmanship [by] J. Pen. Translated from the Dutch by Trevor S. Preston. Includes index. Economics HB171 .P456