For the source text click/tap here: Bava Batra 22
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The new Mishna teaches that one may not build a new wall too close to the old wall of their neighbour's home. One must leave four cubits between the old wall and the new wall. Similarly, one must be careful about the placement of windows. Windows must be four cubits away from walls, whether above or below.
A tradesman who resides outside of a town where his type of business has already been established can be barred from plying his trade in that town.
We explore restrictive commerce and ancient markets.