Sayyiduna Ma'qil bin Yasar (may Allah be pleased with him) said: I heard the Messenger of Allah (peace and blessings be upon him) say: "Whoever interferes in any way in the prices of the Muslims so that the prices of goods rise, Allah Almighty will throw him into a great fire on the Day of Resurrection."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 11150