Buying things and selling them , when price increases: Allowed, Permissible or Forbidden

 The hoarder or profiteer is the one who buys goods when there is scarcity and people need them. It says in the hadiths that this action is cursed and there is a warning against it, because the Prophet (blessings and peace of Allah be upon him) said: “No one hoards except a sinner” and “Whoever hoards is a sinner.”

As for the one who buys food or things other than food that people need at times of ease and plenty, without causing harm to anyone, then when prices go up he sells it to people, without delaying it until a time of extreme scarcity and hardship – rather when prices begin to rise and he can benefit from selling, he sells it – there is no blame on him for doing so. This is the way traders have operated in the past and at present.

Shaykh ‘Abd al-‘Azeez ibn Baaz (may Allah have mercy on him).

Fataawa Noor ‘ala ad-Darb (3/1442).

Refer Complete Answer

https://islamqa.info/en/answers/130313/he-buys-goods-when-they-are-available-and-plentiful-and-sells-them-when-the-prices-rise-is-this-hoarding-or-profiteering