Final answer:
Brand name items have a larger price elasticity than a class or a broad group of items because there are more substitutes available.
Step-by-step explanation:
The reason a brand name item has a larger price elasticity than a class or a broad group of items is because there are more substitutes available for brand name items. When there are close substitutes available, the demand for a product becomes more elastic because consumers can easily find an alternate product instead of paying a higher price.