Economics

The understanding of how the economy functions and how best to maximize profits under current conditions, it's more of a skill for lords to regulate trade under their control. Merchants and the like find it very useful to know how different markets are faring, but it's not particularly useful for some fishmonger that never leaves a dock ever.

Scale:
0: Money is valuable! I know things! Let me explain to economists how this works.
1: Supply and demand is important, I hear.
2: Particularly to Arx, as the central hub of commerce for the continent.
3: That unites the different regional markets all with their own varying needs and goods.
4: That varies based on sub region and individual domains and local variables.
5: And is strongly determined by human factors that you are familiar with.
6: And invisible inhuman ones that take pains to conceal themselves.