Ketchup succeeded where mustard diversified because of taste chemistry

Gladwell examines why supermarket aisles hold dozens of mustard varieties but essentially one dominant ketchup (Heinz), despite both being condiments with plenty of room, in theory, for variation. He traces the answer to a food scientist's research into the five basic tastes — salty, sweet, sour, bitter, and umami — and how ketchup happens to hit all five in a balanced way that most people find close to an ideal, universally satisfying flavor profile.

Mustard, by contrast, doesn't have one obviously "perfect" version most palates converge on, which is exactly what allows a market of distinct mustard styles to coexist, each pleasing a different subset of tastes. The lesson generalizes beyond condiments: some products cluster around a single dominant winner because of an underlying platonic ideal buyers converge on, while others fragment into niches because no such convergence point exists.

Gladwell uses this as a lens for thinking about product design and why imitation-of-a-leader strategies fail in fragmented categories.

Takeaway: before copying a category leader, ask whether your market has a single converging "ideal," or is inherently fragmented.