The Waln House ( completed by 1808, demolished in the 1850's)
A. Kern of Philadelphia,
watercolor and ink wash on paper, 1847.
So far the cheerful crew on our street have contented themselves with cement-sawing neat rectangles in the middle of the roadway, digging up hunks of asphalt and dirt, then filling the holes back in -- after the requisite rest period with shovels. In attendance was a tiny and excessively cute backhoe on treads that looked more like a die-cast miniature than a working machine.
Trade and commerce is/are essential to most societies. World building usually requires some sort of reference to a monetary system, unless goods and services are exchanged on the basis of barter.
The simplest system I've read in fantasy used golds, silvers, coppers in a rising ratio by tens, acceptable across political boundaries no matter what face or design decorated the obverse.
In SF, creds or credits often seem to cover the interstellar necessities nicely.
It's amazing though, the number of characters who seem to swan pro bono through the inns and taverns of various fantasy worlds or never have to pay docking fees for their space ships.
I found a penny yestermorn while walking the dogs. Supposed to mean good luck for the day. Various superstitions surround money -- and just about everything else. Something else to consider while constructing an alternative society.
My silver dollars rattle on dry stalks,
While the calendar creeps toward the cold.