Yes, and? This does not imply that trade is not beneficial. Marx is just saying that exchange of goods in itself does not create new value. He believed in the

Yes, and? This does not imply that trade is not beneficial. Marx is just saying that exchange of goods in itself does not create new value. He believed in the labor theory of value, which means that human labor is the ultimate source of value creation. The idea that trade is never beneficial does not follow from that theory.