For products we buy from Jessica so far (black annealing wire, wooden nail, and concrete nail), usually we’d ask เฮียหนุ่ย to set up retail price at first! Then M would be in charge of adjusting the price up or down! This depends on 1) competition at each store and 2) market price which they (เฮียหนุ่ย and M) know better than us!
As long as we’re still making money (GP is positive), it is fine! However, in some cases, we may have to sell at loss in some stores or period which depending on the two factors mentioning above!