This volume, originally published in 1964, is intended for students of macroeconomic theory and mathematical programming. Part 1 includes critical discussion of debates from the 1950s and 60s in the related fields of income-employment , trade cycles and general prices, with an ultimate view to extending macroeconomic analysis and policy beyond the conventional purview; Part 2 suggests various possible macro applications of mathematical programming techniques to optimization problems, with a secondary view to forwwarding the synthesis of aggregative economic theory and multisectoral input-output analysis.