Where the money comes from is increased monetary stability. Central banks such the Bank of the US would be tends to reduce apparent risk. They tend to put stricter limits on the money you can lend which reduces volatility which tends to lower interest rates in the long run. You tend to have fewer bank panics when you have a central bank of some sort looking after things. Fewer bank panics means more people will tend to put more money in the bank for longer periods of time which reduces the interest rate. With reduced interest rates both farmers and manufacturers are throwing away less money on interest.
Unfortunately, that's not the way things work out in practice.
The Bank of North America, the very first of the US' monopoly banks, tended to promote the centralization of money and credit into the hands of wealthy Philadelphia merchants at the expense of the Pennsylvania hinterland. Terry Bouton has a wonderful little essay in
The Economy of Early America on the subject called 'Moneyless in Pennsylvania: Privatization and the 1780's Depression'. You see, what the monopoly banks (this is more than a century before any concept of real 'central banking' emerged in the US) really represented was the partial privatization of what was once a purely public power: The origination of paper money bills.
Whereas, in PA at least, this power was originally used to establish public land banks throughout the state that lent to farmers using their land as security, the Bank of North America aggregated this power into one bank which then lent almost exclusively to wealthy Philadelphia merchants and financiers. This had the exact effects I described before. The effects you're looking for are curiously absent.
Monopoly banks are half-measures: They're the same sort of ugly private-public partnership that so besmirches public policy today, where a private party is given all the advantages and privileges of a public operation without any of the public duties or burdens to bear. This combination ends up giving us the worst of both worlds: Privilege and power in the hands of greed and avarice.
Hamilton represented the same faction Robert Morris did, but in New York State and at the national level. If he gets his way, we see what happened with the Bank of North America on a national scale: The aggregation of wealth and power into the coastal trading cities, and especially into the hands of the wealthy few who run those cities, at the expense of the vast majority of the country.
Off base what iff: Farmers used the canals he planned to construct, and settle the frontier a strong army would tame.
I know people hate the fact that Hamilton was right about everything.
This is
extremely mean-spirited.
Do you think...what, exactly? Do you think I'm just making these claims because I want to? I've spent the time, effort, and money doing real research on the economy of this period, and into the political economy of banking, money, and credit in general.
All Hamilton was 'right' about was the pursuit of the interests of a narrow section of society that he happened to identify with. The extent of his 'public mindedness' was an almost single-minded drive to make sure the public credit was established so that he and his could turn around and use it to their benefit. Had Hamilton gotten his way, the US would have turned out more like Imperial Germany or Britain: A society with increasingly rigid class structures that depends on the exploitation of an increasingly impoverished lower class of landless laborers at home and an oppressive, autocratic empire abroad.
Even if Hamilton did not intend for that to happen, necessarily, it would have been the outcome of creating the sort of unassailable power base for America's first generation state-capitalists he was trying to create.
You really want America to be a good place? Find some way to have the agrarians compromise with the nationalists so we get a free banking system similar to the one Scotland had at the time. You get all the benefits of a strong, stable system of credit without the drawbacks of concentrating all of the power over that system into very few hands. People in the US were
clamoring for paper money at the time because there was
no specie to be had. The problem wasn't banking and paper money, the problem was this immense growth market was handed over exclusively to the contemporary super-rich
and denied to everybody else.