In order for Dunkin Donuts to sell delicious products to consumers, it is critical that they establish trustworthy relationships with their suppliers. For instance, Dunkin Donuts sells a wide array of juices, milks, and sodas to their loyal customers that need a nice beverage to wash down a chocolate chip muffin or a blueberry cake donut. Brands such as Minute Maid, Coke, and even Tropicana are sold at the store.
Because Dunkin has so many options available within their stores, they have significant channel power over Coke. If Coke decided to hike up the prices of their sodas, Dunkin could easily replace their beverages with Pepsi or even Sprite. Channel power increased for Dunkin because it sells multiple beverage brands instead of a few options.