Institutions like the Amsterdam stock exchange, the Bank of Amsterdam, and the merchant bankers helped to mediate this investment.In the course of time the invested capital stock generated its own income stream that (because of the high propensity to save of the Dutch capitalists) caused the capital stock to assume enormous proportions.The "constitution" of the new Republic, the Union-of-Utrecht treaty of 1579, tried to lay the basis of a revolutionary new fiscal system.It put in place a rudimentary confederal budget system that charged the Raad van State (Council of State Furthermore, it prohibited internal tariffs and other taxes discriminating against residents of other provinces.
Instead, the provinces continued the practice under the Habsburg rulers that the provinces paid a fixed quotum (the repartitie) of the budget.
That central government was therefore forced to finance the war by transfers from other Habsburg lands, especially Spain itself.
This led to an enormous increase in the size of the Spanish public debt, which that country was ultimately unable to sustain, and hence to the need to accept Dutch independence in 1648.
The Dutch financial sector, both in its public and private components, came to provide a wide range of modern investment products beside the possibility of (re-)investment in trade and industry, and in infrastructure projects.
Such products were the public bonds, floated by the Dutch governments on a national, provincial, and municipal level; acceptance credit and commission trade; marine and other insurance products; and shares of publicly traded companies like the Dutch East India Company (VOC), and their derivatives.
As explained in the general article on the economic history of the Netherlands, the political revolt soon engendered an economic revolution also, partly related to political events (like the rise of the Dutch East India Company and its West-Indies colleague), in other respects unrelated (like the revolutions in shipping, fisheries, and industry, that seem to be more due to technological innovations).