Scenario :

Kellog's makes Raisin Bran, Granola Raisin & Honey Frosted Flakes cereal, Apple Jacks cereal, and Smorz cereal, among others-in all more than forty varieties of breakfast cereal. General Mills, one of Kellog's many competitors, make Cheerios, Chex, Trix, and so on. From this scenario, which condition of a perfectly competitive market could most directly be violated in the market for breakfast cereal?