Marketing is a battle of perception, not of product
The central idea of the book is simple to state and hard to accept: marketing is not a war of products, it is a war of perception. The winner is not whoever has the best product on the shelf, but whoever holds the best spot in the customer's mind.
Think of the corner diner: the owner may swear his sandwiches are fresher than the competitor's two blocks down, but if customers have already decided, in their heads, that the other place is the neighborhood hangout, the recipe for the sandwiches won't change the outcome.
This also explains why being first in the customer's mind weighs more than being first on the shelf: it doesn't matter when the product reached the store, it matters when it entered the customer's head as the reference for that type of thing. That is why one name becomes a synonym for the whole category, like asking for a Kleenex when you mean any tissue, even when you buy another brand.
