In an industry analysis using Porter's Five Forces, the suppliers have great power if:
a. The industry rivals are large and buy only standardized inputs.
b. The industry's customers are large and buy only standardized inputs.
c. The industry buys specialized (differentiated) products and to change suppliers would require expensive refitting of manufacturing.
d. The industry's customers buy very specialized (differentiated) products and it would be expensive for the customers to change providers.
e. The industry is made up of many producers, some large and some small.