Sugli investimenti cheimplicano un fissato ritmo istantaneo di espansione di un sistema economico.

It is well known how investments, put into an economic system, wear out, so that after a certain time they finish. If we make an apt hypothesis, the rythm according to which the investments are put into the system determines the rythm according to which the investments are put into the system determines the rythm according to which these investments finish. It is easy to understand the meaning assumed by the ratio between the rithm according to which the investments, put into an economic system, finish and the rithm according to which these investments are put into the system. Because of its meaning, such a ratio is named growth ratio. The aim of this paper is to find out the rythms of investment, and hence of amortization, which implicate a pre-established course to the growth ratio. Such being the case we must observe that the knowledge of these rythms is necessary when the activities of the economic system need to be planned. [ABSTRACT FROM AUTHOR]