Sector -- is a sector of the economy such as farming or manufacturing. This object is in charge of producing the sector's output, such as food or manufactured goods. Sector is only used at the lowest level of the economy, for example the economy associated with a MapSquare.

SectorStats -- are statistics associated with a given sector of the economy. Things like how much is produced in a sector, what the wages are, etc. SectorStats can be held at any level of the economy, even the economy for the whole civilization will have a SectorStats object associated with the agriculture sector.... In this case the statistics will simply be the aggregated statistics of all the smaller units in the civilization.

EconStats -- are the same as SectorStats, except the information it holds pertains to the economy as a whole, rather than an individual sector.

Marketplace -- handles prices for various goods, and mediates trades between the government, the people, and merchants

PrivateSector -- handles what non-government individuals do when they get their hands on stuff... Consumption of goods by the public, as well as investment, and decisions by new workers of where they should work (provided the government gives them that discretion) are covered here.

PublicSector -- stores and implements government orders regarding the economy

Infrastructure -- Educational institutions, military training facilities, etc. Infrastructure does all the things that buildings do in Civ2.

The things above can be assembled into various Economy objects. Right now I am coding up a version of the economic model where most of the action happens at the MapSquare level. That is the version of objects I will present here. It is also possible that we will run the economy at the Province level primarily, and just keep track of some limited information at the MapSquare level. I think the collection of basic objects I have is sufficient to do both options, but I'm focused on the MapSquare-level economy now. For now the information on the different types of sector is available, and also infrastructure, is held in associated "Info" classes. So the SectorInfo class has information about the farm sector, resource extraction sector, manufacturing sector, and services sector. At some point we may make these independent objects (FarmSector, ServicesSector) that inherit from a base Sector class.

MapSquareEconomy

• EconStats
  
• Sectors (each sector has a SectorStats object)
  
• Marketplace
  
• PrivateSector
  
• PublicSector
  
• Infrastructure (actually, infrastructure is held in the MapSquare in each Terrain type, I just list the infrastructure here because it is an important component of the economy)
  

HighLevelEconomy (This can either be an economy associated with a Civilization or Province. So there will really be to classes that inherit from HighLevelEconomy, but they are similar so I won't distinguish between them here)

• EconStats
  
• SectorStats for each economic sector
  
• PublicSector
  

[edited]
Wonders will be a different animal from ordinary infrastructure. After a little thought, I'd say Wonders should be completely independent from Infra. Although if there turn out to be unifying features we can have a Wonder as an Infra object, just with more capabilities or data, and some limitations, like it only works when completed.

Marketplace is just for prices and deals.

There will be an independent Merchant class that will encompass:
trade routes,
capital controlled by the merchant (which a ruler can confiscate, but then screw up the economy just as in real history),
cargo capacity available and whether for land, sea or whatever, and
specific routes used

other possible fun things are that certain Merchants can be characters, guard strength or whatever if we do pirates, and I'm sure I've forgotten other good stuff.

The econ coding is going pretty well. Most of the map square level stuff is done enough for the first release. I also have crude infrastructure classes running. I've put in a "consumer stuff" class to give the people something to invest in that improves their physical well-being. Once all the bugs are kicked out, I could add as many infra classes as we want.

Next steps:

First I will flesh out the PublicSector class so the govt can give orders to the economy. Then I will work on getting the high-level econ stuff (CivEconomy etc.) going. Then I'll move on to a simple alpha interface.

Then it will be time for a release!

Following that I'll be ready for infra again in detail. After that Trade and Merchants.