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A New Model of Economic Growth

In: Readings in the Theory of Growth


  • N. Kaldor
  • J. A. Mirrlees


The purpose of this paper is to present a “Keynesian” model of economic growth which is an amended version of previous attempts put forward by one of the authors in three former publications.1 This new theory differs from earlier theories mainly in the following respects: (1) it gives more explicit recognition to the fact that technical progress is infused into the economic system through the creation of new equipment, which depends on current (gross) investment expenditure. Hence the “technical progress function” has been re-defined so as to exhibit a relationship between the rate of change of gross (fixed) investment per operative and the rate of increase in labour productivity on newly installed equipment; (2) it takes explicit account of obsolescence, caused by the fact that the profitability of plant and equipment of any particular “ vintage ” must continually diminish in time owing to the competition of equipment of superior efficiency installed at subsequent dates; and it assumes that this continuing obsolescence is broadly foreseen by entrepreneurs who take it into account in framing their investment decision. The model also assumes that, irrespective of whether plant and equipment has a finite physical life-time or not, its operative life-time is determined by a complex of economic factors which govern the rate of obsolescence, and not by physical wear and tear; (3) in accordance with this, the behavioural assumptions concerning the investors’ attitudes to uncertainty in connection with investment decisions and which arc set out below, differ in important respects from those made in the earlier models; (4) account is also taken, in the present model, of the fact that some proportion of the existing stock of equipment disappears each year through physical causes—accidents, fire, explosions, etc.—and this gives rise to some “ radioactive ” physical depreciation in addition to obsolescence; (5) since, under continuous technical progress and obsolescence, there is no way of measuring the “ stock of capital ” (measurement in terms of the historical cost of the surviving capital equipment is irrelevant; in terms of historical cost less accrued “ obsolescence ” is question-begging, since the allowance for obsolescence, unlike the charge for physical wear and tear etc., depends on the share of profits, the rate of growth, etc., and cannot therefore be determined independently of all other relations), the model avoids the notion of a quantity of capital, and its corollary, the rate of capital accumulation, as variables of the system; it operates solely with the value of current gross investment (gross (fixed) capital expenditure per unit of time) and its rate of change in time. The macro-economic notions of income, income per head, etc., on the the other hand are retained.

Suggested Citation

  • N. Kaldor & J. A. Mirrlees, 1971. "A New Model of Economic Growth," Palgrave Macmillan Books, in: F. H. Hahn (ed.), Readings in the Theory of Growth, chapter 13, pages 165-183, Palgrave Macmillan.
  • Handle: RePEc:pal:palchp:978-1-349-15430-2_13
    DOI: 10.1007/978-1-349-15430-2_13

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