In my setting there is a colonial empire that has industrialized and extracts wealth from its urban holdings with the sale of tax collecting privileges to the highest bidder in a manner analogous to the Roman Publicani. They also have a monopoly on the sale of alcohol and opium in the same way the Chinese dynasties often had monopolies on salt and iron. My only concern is that if this is revenue stream is actually enough to support the financial needs of a state.
Other key points:
• Technology level is analogous to 1870’s Western Europe/United States
•Gold standard is used.
•Ruling ideology is mercantilist in its economic understanding.
•State needs to support a standing army of decent size and equipment (half a million strong and equipped in 1870’s standard)
•Rural areas are taxed differently as the land is either owned by collaborating local elites or colonists who are taxed on a very modest percentage of their total production. (The amount is often token from more powerful collaborating elites) the rural population is around 80 million.
• Total urban population is 20 million split between five cities.