... the explanation of a phenomenon. If we explain theeconomic character of goods of first order by that of goods of sec-ond order, the latter by the economic character of goods of thirdorder, ... satisfaction of their special needs but tothe satisfaction of the needs of the totality of individuals com-112 Principles of Economics18“Zweckvermögen.”—TR.posing the economy, then we do, of course, ... requirements are: (1)102 Principles of Economicsgrowth of population, especially if it occurs in a limited area, (2)growth of human needs, as the result of which the requirements of any given population...