tion of large lntersectoral scientific and technQioglcal pro­ grammes together with the existing prices the so-cal led complet• lng costs of mlnlg and agricultural produce are widely used. In determining the economic efficiency of new products of high quality the calculation Is based not on a selling price but on the price upper llmlt reflecting the economy of expendltureof user of new technology and so on. The afore said methods· which are widely used In modern planning and project preparation acti­vities are based on a theoretical concept of comparative effi­ ciency of capital Investment. A considerable contribution to Its development has been made by such outstanding Soviet economists Presented by o.s. Lvov as V.V. Novozhllov, A.l. lourte, .• L.A. Vaag, T.S. Kharatu'rov and others. later the methodology of comparative efficiency. has merged with a general theory of optimal planning and management of the socialist economy whose elaboration. and devetoment resul­ ted from the work done by L.V. Kantorovlch, A.G. Aganbegyan, N:P. Fedorenko. V.F. Pugachev. S.S. Shatalln, N.Ya. ·Petrakov, etc.· . It might be very useful to generalize our country's experience In the field of technical-economic substantiation and to use It In the system of economic me~surement of scientific and technological progress. In selection of the best large S and T development projects from the national ec-onomy point of view. In this connection the subsequent part of the present pap•~ Is dedicated to prtncclpal problems of methodology of determining economic efficiency of new technology. 1. Methodology of general and cpmppratlye efficiency Modern practice of economic ·substantiation of planning and project preparation decisions ts·characterlzed by a wide use of two fundamental principles. namely general and comparative efficiency of capital Investment.• General efficienCy Is determined as a ratio of the national Income to the production funds or a ratio of the national Income 
**Analysis**
The text appears to be discussing the methodology of evaluating the economic efficiency of new technologies, particularly in the context of socialist economies. It mentions the use of various concepts and principles, such as general and comparative efficiency of capital investment, and references to Soviet economists and their contributions to the development of these concepts. The text does not seem to be focused on a specific industry or sector, but rather on the general principles and methodology of evaluating economic efficiency.

**Category**
Science and technology, Economic development