"First of all I want to remind you of the essential features of models. In my opinion they are: drawing up a list of the variables to be considered; drawing up a list of the equations or relations the variables have to obey and testing the validity of the equations, which implies the estimation of their coefficients, if any. As a consequence of especially we may have to revise and so as to arrive at a satisfactory degree of realism of the theory embodied in the model. Then, the model may be used for various purposes, that is, for the solution of various problems. The advantages of models are, on one hand, that they force us to present a "complete" theory by which I mean a theory taking into account all relevant phenomena and relations and, on the other hand, the confrontation with observation, that is, reality. Of course these remarks are far from new."

“It is my hope that in such a way we may again, as Marx claimed, find scientific arguments in the competition between various systems, but up-to-date scientific arguments rather than obsolete ones. This more fundamental research in economics deserves relatively more attention and resources than the more superficial versions of economic research directed at forecasting or analysing very short-term fluctuations in market prices, on which quite some money is being spent to-day.”

“An inequality-furthering phenomenon is technological development. But need it be? Increasingly we get the feeling that technological development is not simply something given, but that it may be guided, within limits.”

“The world is in a process of a great transformation. In a considerable part of it a new economic order, "communism," is being vigorously tried out. Elsewhere an old order is passing as one country after another throws of the yoke of colonialism. The wholesale introduction of Western techniques and ways of life shaking the foundations of numerous beliefs and attitudes, for good and for evil.”

“The dominant role played by... exporters’ and importers’ GNP and distance in explaining trade flows.”

“The shaping or reformulation of the aims of economic policy which are only vaguely felt may be exemplified in the aim of social justice.”

“The main sources of tension in today's world economy could be grouped under the following categories:”