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[1.] Svr/Fragment 102 25 - Diskussion
Bearbeitet: 24. February 2020, 13:07 ([[Benutzer:|]])
Erstellt: 14. January 2020, 06:34 [[Benutzer:|]]
Fisher Pry 1971, Fragment, Gesichtet, KeineWertung, SMWFragment, Schutzlevel, Svr

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Untersuchte Arbeit:
Seite: 102, Zeilen: 25-30
Quelle: Fisher Pry 1971
Seite(n): 75, Zeilen: 30 ff.
Fisher and Pry (1971) developed a substitutional model of technological change based on three assumptions: (a) many technological advances can be considered as competitive substitutions of one method of satisfying a need for another. (b) If a substitution has progressed as far as a few percent, it will proceed to completion. (c) The fractional rate of fractional substitution of new for old is proportional to the remaining amount of the old left to be substituted.

Fisher, J.C. & Pry, R.H. 1971, “A Simple Substitution Model of Technological Change”, Technological Forecasting and Social Change, vol.3, pp. 75-88.

The model is based on three assumptions: (1) Many technological advances can be considered as competitive substitutions of one method of satisfying a need for another. (2) If a substitution has progressed as far as a few percent, it will proceed to completion. (3) The fractional rate of fractional substitution of new for old is proportional to the remaining amount of the old left to be substituted.1

1 A special form of Pearl's law; cf. Raymond Pearl, The Biology of Population Growth (New York: Alfred A. Knopf, 1925).

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