Gustav Schmoller (1838-1917) was Professor at the University of Berlin and the leader of what was known as the 'younger' or 'late' Historical School of German economists. As such he was one of the principal figures in the Methodenstreit. His book The Mercantile System and its Historical Significance (1884; tr. 1897; reprint 1989) seeks to explain the transition in central Europe from the town economies of the late Middle Ages to the national economies of the nineteenth century, with special reference to mercantilism and its role in this transformation. His approach is principally an historical institutionalist one:
What I have in mind,is the connection between economic life and the essential, controlling organs of social and political life, - the dependence of the main economic institutions of any period upon the nature of the political body or bodies most important at the time.
In every phase of economic development, a guiding and controlling part belongs to some one or other political organ of the life of the race or nation... ...It may or may not coincide substantially with the contemporary organisation of the state or of national, intellectual, or religious life; nevertheless it rules economic life as well as political, determines its structure and institutions, and furnishes, as it were, the centre of gravity of the whole mass of social-economic arrangements. Of course it is not the only factor that enters into the explanation of economic evolution; but it appears to me the fullest in meaning, and the one which exercises the most penetrating influence upon the various forms of economic organisation that have made their appearance in history. (pp2-3)
It seems here that Schmoller is singling out the constitutional and legal institutions as the primary determinant of the form of economic life. He goes on to elaborate a bit on the relationship between political order and economic order:
Within the village, the town, the territory, and the state, the individual and the family have retained their independent and significant position; division of labour, improvement of the currency, technical advance, have each pursued their course; the formation of social classes has gone on in particular directions; and yet economic conditions have, throughout, received their peculiar stamp from the prevalence at each period of a village economy, a town economy, a territorial economy, or a national economy; from the splitting asunder of the people into a number of village- and town-economies loosely held together, or from the rise of territorial or national bodies which have taken up into themselves and brought under their control the earlier economic organs. Political organisms and economic organisms are by no means necessarily conterminous; and yet the great and brilliant achievements of history, both political and economic, are wont to be accomplished at times when economic organisation has rested on the same foundations as political power and order. (p3)
The tool of dialectic is obviously in the back of his mind here, contrasting the political and economic 'organisms' and the relationship between economic progress and their mutual compatibility (ala later economists such as Max Weber, Douglass North, etc).