So, I have a Class I city located on the mouth of a river. It has a trade range over road of 168 miles, and along the river and out to sea of 480 miles.
The road isn’t a big deal. There are no cities within that range. The river, however, includes several cities. Here’s my interpretation:
Starting point:
- City A (I) Silk -4
- City B (IV) Silk +1
- City C (III) Silk +2
- City D (IV) Silk -2 (in range of B, C, E)
- City E (V) Silk -1 (in range of D)
City A affects B and C.
- City A (I) Silk -4
- City B (IV) Silk -1
- City C (III) Silk +0
- City D (IV) Silk -2 (in range of B, C, E)
- City E (V) Silk -1 (in range of D)
City C affects B and D.
- City A (I) Silk -4
- City B (IV) Silk +0
- City C (III) Silk +0
- City D (IV) Silk +0 (in range of B, C, E)
- City E (V) Silk -1 (in range of D)
City B and D affect each other (no change). D affects E.
- City A (I) Silk -4
- City B (IV) Silk +0
- City C (III) Silk +0
- City D (IV) Silk +0 (in range of B, C, E)
- City E (V) Silk +0 (in range of D)
Does that look right?