This is a way of saying that the Lord’s judgment against Judah is going to reach all parts of society, including those who would be most likely to trust in their own ability or creativity: the merchants and businessmen. The city as a center of culture, trade, luxury, beauty, and craftsmanship would come to an end.
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11 Wail, O inhabitants of the Mortar! For all the traders are no more; all who weigh out silver are cut off.