Walmart is working with its suppliers, using tools such as electronic billing, purchase order verification, and bar code technology, to integrate data used to improve overall performance. is this an exampled of a vertical marketing system?

Which factor contributed to the rise of african empires such as ghana and mali ? a. their creation and involvement in trade networks b. they focused only on agricultural production. c. they didn’t engage in warfare with other nations d. their geographic location protected them from attacks.