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If you think about the differences between a poor peasant society, a relatively affluent society such as an 18th-century English city, and a 21st-century technological society as we experience in much of the West, one of the big differences is the sheer amount of infrastructure that we have. If you think about roads, power plants and power lines, sewers, networks of schools and hospitals, and on and on, it’s a little bit staggering to think about how sheer stuff had to be built to enable our modern lives—and how much money had to be spent in order to build it all.
In poor societies of yesteryear, roads are typically mud tracks. Electricity does not exist, and people often had to cut their own firewood. What “public” facilities there were, such as single-doctor clinics, are small scale. This is not merely a question of technology. The Roman roads were tremendously useful tools of power projection (and consequently, tools of commerce), yet they remained the gold standard for perhaps fifteen hundred years in Europe because few people wanted to pay the huge amount of money it would take to extend, or even maintain, the road network. Even in major post-Roman European cities, there were no paved roads until the 13th century. (Baghdad had streets paved with tar beginning in the 8th century.)
What this means is that to take a society from abject “backwardness” to a high level of “development” (in the sense of Alexander Gerschenkron) takes not merely technology, or manufacturing ability, but the money and other resources to build the massive amount of stuff necessary.
Some types of development can be done gradually, in a decentralized manner. For example, local communities can each build a school, without necessarily needing to coordinate with other communities or a national authority. However, other types of development functioned more effectively if they were coordinated at the national level. (Or at any rate, that’s how it tended to work in our actual history, with the types of technology that we had to work with and the kinds of conceptual models that our national planners used, given the role of massive scale in the 19th and 20th centuries.) For example, the electrical grids in 19th- and early 20th-century Western European countries tended to be much more stable than those of America at the time (and even today), because the American grid was a patchwork of local grids built by local power companies, whereas the European grids were built according to a national plan, with money and resources mobilized from the entire country.
One key element in this was the role of massive banks. America had an early lead in its financial development, due to the proliferation of local state-chartered banks that soon blanketed American society. These banks were a tremendous stimulus to local and regional commerce and the development of new settlements. (The English experience was broadly similar, although it was still relatively difficult to start a bank in England.) European powers were slow to catch up, but in the 19th century settled on a strategy of having centralized national banks that would finance not merely local businessmen, but the vast infrastructure projects of modernization. America was hobbled by the system of unit banking, which tended to keep banks relatively small, and by the lack of a muscular national bank. (Such a lack was not necessarily bad, as the conflicts over the Banks of the United States indicate!)
In an era before banks, much wealth is economically sterile—golden and silver goblets sitting in some nobleman’s vaults (for example), where they do not contribute to ongoing commerce. But when such wealth is deposited in a bank, it can serve as the basis for lending and new capital investment. (It can also promote new kinds of systemic risks, but that’s a different discussion.) Banks thus can mobilize formerly unproductive resources and put them to good use. And when the bank is national in scale, it can attract the money of the vast middle and even lower classes (in the case of the postal banks of e.g. Germany and Japan) and pool the money into a vast fund, which can then be used by the state in its development plans.
Banks are not the only way to do this, of course. But in our history at least, the alternative was coercive taxation or sheer plunder by the state (as in the case of Tsarist Russia, and later the Soviet Union).
At any rate, the key point here is that to build up a society takes a lot of money, and often that money has to be pooled somehow and deployed in coordinated projects. How that process works in your invented setting is, of course, entirely up to you.
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(This post is part of Politics for Worldbuilders, an occasional series. Many of the previous posts in this series eventually became grist for my handbook for authors and game designers, Beyond Kings and Princesses: Governments for Worldbuilders. The topic of this post belongs in the planned second book in this series, working title Wealth [Commerce?] for Worldbuilders, along with some overlap with the planned third book, working title Tyranny for Worldbuilders. No idea when they will be finished, but it should be fun!)