For the source text click/tap here: Bava Batra 89
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Our Gemara teaches, based on the passage in Devarim (25:14) that market inspectors are appointed to ensure the honesty of weights and measures, but no such inspectors are appointed for checking that prices are fair.
The Gemara relates that Shmuel asked Karna to teach publicly that market inspectors are appointed only to oversee measures, but no such inspectors are appointed to regulate prices.
We continue our exploration of weights and measures in antiquity.