The main sources of tension in today's world economy could be grouped under the following categories: - Jan Tinbergen

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

The two preponderant forces at work are technological development, which made for a relative increase in demand and hence in the income ratio... and increased access to schooling, which made for a relative decrease.

A just social order can best be described as a humanist socialism, because its goal would be the establishment of equal possibilities within and between all countries, and at its base would lie universal human values