The argument for capitalism (and ultimately historicism) is a syllogism that looks like this:

Major Premise) We have a moral duty to contribute to the common good

Minor Premise) Limitless accumulation contributes to the common good

ERGO) Limitless accumulation is a moral duty

This argument leads to historicism because the fundamental premise is that processes which are unguided (limitless accumulation) lead to ends (the common good) which are unplanned.

NRH, p. 315: "The good order or the rational or the rational is the result of forces which do not tend to the good order or the rational. The principal was first applied to the planetary system and then to the system of wants, i.e. to economics."*

* Cf. Hegel, Rechtsphilosophie, sec. 189 Zusatz.

"Political economy is the science which starts from this view of needs and labour but then has the task of explaining mass-relationships and mass-movements in their complexity and their qualitative and quantitative character. This is one of the sciences which have arisen out of the conditions of the modern world. Its development affords the interesting spectacle (as in Smith, Say, and Ricardo) of thought working upon the endless mass of details which confront it at the outset and extracting therefrom the simple principles of the thing, the Understanding effective in the thing and directing it. . . . The most remarkable thing here is this mutual interlocking of particulars, which is what one would least expect because at first sight everything seems to be given over to the arbitrariness of the individual, and it has a parallel in the solar system which displays to the eye only irregular movements, though its laws may none the less be ascertained."

To find this same sort of argument in Newton, see the General Scholium to Book III, The System of the World, in the Principia.