the Prophet forbade artificially inflating prices.
Sunan an-Nasa'i Book 44, Hadith 57
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"Do not urge someone to cancel a sale he has already agreed upon so as to sell him your own goods, unless he bys or changes his mind."
Sunan an-Nasa'i Book 44, Hadith 56 Next Hadith → "I heard the messenger of Allah say: "No man should urge anyone to cancel a sale he has already agreed upon with his brother so as to sell him his own goods; no town-dweller should sell for a desert-dweller; do not artificially inflate prices; no man should outbid his brother; and no woman should ask for her sister (in faith) to be divorced so as to turn over what is in her vessel (deprive her of her share of maintenance),
Sunan an-Nasa'i Book 44, Hadith 58
Sunan an-Nasa'i Book 44, Hadith 56 Next Hadith → "I heard the messenger of Allah say: "No man should urge anyone to cancel a sale he has already agreed upon with his brother so as to sell him his own goods; no town-dweller should sell for a desert-dweller; do not artificially inflate prices; no man should outbid his brother; and no woman should ask for her sister (in faith) to be divorced so as to turn over what is in her vessel (deprive her of her share of maintenance),
Sunan an-Nasa'i Book 44, Hadith 58