Paying through the note
The money must flow.
Players start with a base fortune.
They may invest that fortune in City States so that they are able to construct buildings useful to the players.
Some buildings accept money as inputs to produce their product.
Some buildings accept resources as inputs and produce money as their output.
City States will accept resources from players to construct buildings or perform actions. If done during the player phase this purchase will be reflected as an increased investment base for the player even though no money explicitly moved. If done during the City State phase money will move from the City State treasury to the players.
Some buildings may only be constructed during the player phase, other during the City State phase.
Some buildings instantly reward the constructor with money from the bank.
At the end of each round the City States levy taxes. Money is paid from the bank to the City States for each building in that City State. Players must give money to the City State for each product marker they have on a building in the state.
Not all buildings or product markers tax at the same rate.
Players may trade ownership of product markers. They may accompany such trade with money.
City States may conquer or subsume other city states. In short this is done by gaining control of the other City State’s centre. Upon successful conquest much of the treasury of the conquered state is divided among the larger investors of the winning City State. The remaining funds are added to the winning City State’s treasury. Investments in the old state translate linearly to the new larger state.