What is the ruling on working for a company that sells counterfeit (second-grade) printer ink cartridges, and informs the buyer of that, given that original manufacturers fight counterfeit ink cartridges, and is it permissible to work there as a storekeeper?

Companies are permitted to sell second or third-grade materials, as the 기본 principle in transactions is permissibility. However, this is conditional upon clarifying the true quality of the goods to the buyer and ensuring they do not bear a different brand's ink mark. If, however, they are an imitation bearing the name of the original material but differing in quality, then this constitutes deception (ghish) and uncertainty (gharar), and selling them is impermissible.