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Mar 19, 2018 at 17:54 comment added jkf I had in mind for some reason the Roman era, but couldn't find anything very well documented. However the salt mine (wikipedia) at Wieliczka, Poland seems to have driven the Polish economy throughout the Middle Ages, leading to something called "The Polish Golden Age", which I had never heard of, but seems significant to Polish and European history, and quite comparable to somewhere like the UAE. So there is an example, I certainly learned something new from my idle speculation! :-)
Mar 16, 2018 at 21:35 comment added pokep @jkf But was there a salt boom somewhere? I imagine there was, but I can't point to one off the top of my head.
Mar 16, 2018 at 17:03 comment added jkf You could add salt to this list; like oil, demand for this was quite inelastic in pre-refrigeration times, and while it was possible to produce in small quantities for nations without large natural deposits (synthetic oil vs. evaporation of sea water) these methods did not scale well, so it was frequently part of a global trade network.
Mar 15, 2018 at 17:22 history answered pokep CC BY-SA 3.0