What is self-production and self-marketing? What are the advantages and disadvantages of self-production and self-marketing?

Is the integration of production and marketing. For example, the general sales model is to purchase goods from manufacturers, and then raise prices to earn the middle price difference. However, self-production and self-marketing have lower cost, price advantage and higher profit in sales because of omitting intermediate links. As for the disadvantages, it may lead to unsalable products due to improper marketing model, and eventually lead to low-price selling, which may eventually lead to losses. Pure hands, welcome the landlord to consult and adopt.