Whether supplier bargaining power represents a strong or weak source of competifue pressure is allected by how fast the prices of the items being funithed by suppliers are rining or falling. the rember of surpliers of a particular item-greater than ten supeliers translates ins meak succlier power, while fewer than Sen supplers translates into strong supplier power. whether the item being supplied is a standard liem for commodity) oc, instead, whether certain supollers provide a differentiated input that enhances the performarice or quality of the industry's product. How long industry members have been closely collaborating with their key supplers-long-term close collaboration greatly strengtiens supplier barguiring power. the extert fon which industry memters have strongly or meably diflerentiated products.