This paper covers those parts of elementary logic that are needed in an introductory course on philosophy of science and the methodology of economics. With this aim in mind, much of the technical material from standard logic courses can be dropped. Specifically, the exposition emphasizes the...

The paper proves a theorem on modified Kuhn-Tucker conditions for the case where a linearly homogenous function is part of the target function. These conditions are necessary and sufficient if target function and constraints satisfy certain re-quirements. Moreover, the envelope theorem can be...

The paper considers intersectoral capital mobility in the context of investment theory. Convex costs of adjustment explain imperfect mobility of capital between sectors. Stocks of capital are endogenous; the model essentially is a twosector growth model with Keynesian investment functions. The...