With those observations in mind, the ACKS trade rules do, I think, provide a useful scale for Market Area. That is, the locations from which a city draws immigrants, as well as natural and agricultural resources and to which it regularly exports both it's own manufactures and items obtained from trade outside the Market Area.
Spherical Cows of Uniform Density
One of the comments I received about the previous post was that the circles denoting trade routes were unrealistic. Which is quite true, I just wasn't prepared to tackle it in the first post. The circles defined the outer limits of trade in a perfect world where we assume roads run on flat plains in every direction, which the maps show to be a false assumption. So lets start refining those assumptions.
ACKS lists Range of Trade (Roads) for Class I Markets as having a maximum distance of 168 miles or 28 six mile hexes. The comes to 33.6, round it up to 34, five mile hexes from the Wilderlands maps.
Assumption: This Range of Trade is for travel on a road. That is a patrolled and maintained pathway which has features, such as bridges, cuttings, ferries, etc to facilitate travel across natural obstacles. Off road travel distances are shorter.
ACKS Movement Multipliers
|Terrain||Multiplier||Trade Range||Hexes (Wilderlands)|
|Road or Clear Wide Trail||*3/2||168 miles||34|
|Desert, Hills, Woods||*2/3||75 miles||15|
|Jungles, Swamps, Mountains||*1/2||56 miles||11|
All well and good, except that I need to handle trade routes crossing all of the terrain types. So I'm going back to my roots in counter and hex war gaming and converting things to Movement Points. Land based trade routes are 34 Movement Points in length, they spend MPs according to the following table.
Trade Route Terrain Movement Point Costs per hex
|Terrain||With Road||Without Road|
|Plains||1||3MP every 2 hexes|
|Desert, Hills, Woods||3MP every 2 hexes||2|
|Jungles, Swamps, Mountains||2||3|
After installing Crouton and GIMP on my Chromebook, and converting the maps from PDF, plus a few hours of counting hexes - probably not completely consistently - here's the boundaries (black lines) and Market Area (red overlay) for the City State of the Invincible Overlord.
|Click to Embiggen|