Fair Trade products might cost more than products that are not Fair Trade, why?

To help the poor, they cannot buy form the buyers that offers the best prices.

Explanation:

Fair trade is an arrangement that is made to help developing nations attain sustainable trade. It focuses on specific commodities that move from the developing nations to the developed ones. Such as coffee, wine, sugar, and flowers. They change premium as the farmers have to sell their products to the monopsonist cooperative that may be inefficient or corrupt. They cannot buy from those that offer the best price.

I'm pretty sure it's c. extremely gradual but not 100% sure though.