If there was no lying involved, yet the seller charged the buyer an exorbitant price, such as a price much more than the commodity’s worth, then this is a case of ghabn, or inequity, which is either:
1) Minor, and that is inconsequential by agreement, or:
2) Out of the ordinary.
According to the stronger position, the distinction between the two is judged by people’s customs and standards.
Keep in mind that there are cases of inequity that are indicated in the Sunnah, such as interception of goods, provocation, various forms of cheating, and so on. In all these cases, the buyer has an option to cancel.
The inequity discussed here is when no deception or cheating was involved, yet the seller overcharged the buyer. Does that give the buyer the option to cancel?
The answer is controversial, and the majority, including (H, +M, +S) indicated that it does not. They argued that the sale is final by