This monograph derives from familiar economic principles the dynamics of national income, the interest rate, employment, the value of capital stock, prices, and the cumulative balance of payments. This is a Volterra neutral integrodifferential game of pursuit. The quarry control is government intervention in the form of taxation, control of money supply, tariffs, foreign credit, interest equalization tax, preferential trade agreements (which reduce trade barriers and enhance trade flows between nations), transportation and distance between trading partners. The work provides conditions for controllability and then deduces how big government intervention (compared with private firms' contributions) should be to ensure the possibility of growth. The reader is assumed to be familiar with advanced calculus and to have a working knowledge of ordinary differential equations. The required theory of hereditary systems can be obtained from the book itself An Efficient Algorithm for Template Matching / I. J. Anderson, J. C. Mason and D. A. Turner -- A Mathematical Model of Geometric Errors in the Case of Specification and 3D Control of Mechanical Parts / E. Ballot and P. Bourdet -- Optimisation Algorithms for Generalised Distance Regression in Metrology / M. Bartholomew-Biggs, B. P. Butler and A. B. Forbes -- Quality Evaluation of Data Processing in Measurement: Bridge between Algorithms and Programs / I. B. Chelpanov, V. A. Granovsky and T. N. Siraya -- An Application of Bootstrap Regression to Metrological Data with Errors in Both Variables / P. Ciarlini and G. Regoliosi -- A Discussion of Approaches for Determining a Reference Value in the Analysis of Key-Comparison Data / M. G. Cox