i suggest following
1.Key currency
One city can issue cash because that city money is key currency(example:dollar)
2.import and export
If i build factory1 at A city and build retail store1 at B city.
And if the retail store1 retail factory1's stuff.
Make this mean A city export to B city.
And if one city(A) export to another city(B).
Grow A city's gdp and wage
Make A city's Cash holdings up
3.key currency and import export
If A city can issue cash ,that make A city can import more than export
Key currency and import export suggestion
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