Suppliers can affect your cost. For example, you are the owner of the shop. If you can buy products in a very cheap price, it would be good for you because you can make more profit on that. On the other hand, if suppliers sell you products in high price, you are going to lose revenue.
These are external shareholders of a business organization. It affects the business organization in so many ways. Competitors increase the competition in order for business organizations to step up their game. Customers are needed for the business organization to generate profit. Suppliers gives the raw materials to be manufactured by the business organization and sold to the consumers.