Can you move a stand if it is the last stand in a square?Quoting the Rules: You may use a Relocation investment to remove the last trade house at a market stall to add it to another location you own, as long as your total number of businesses remains at 4 or above. (my own underline for emphasis).
If you dont have any stand left in your pool, can you start a new bussiness in a square with stands from other squares (moving them)?
So move it, yes (subject to the 4 requirement). But to an new/empty stall, no.