Harper Perennial's top 10 neighbors span book publishers, literary magazines, a food blog, and two elected officials — all within a narrow similarity band of 0.92 to 0.95, with no single dominant pull. Similarity here measures how closely two entities' audiences resemble each other in composition; the tight range means the top 10 form a cluster rather than a hierarchy.
Four of the ten neighbors are fellow book publishers: Harper Books at 0.95, W. W. Norton & Company at 0.94, Penguin Books USA at 0.93, and Tin House at 0.93. Two are literary magazines — NYer Page-Turner at 0.93 and The Paris Review at 0.92 — and one is a website, NYT Watching at 0.92. That leaves three neighbors outside the literary-media cluster entirely: Food52, a food and cooking blog, sits at 0.94 — the second-highest score in the set — while Kirsten Gillibrand at 0.92 and Chuck Schumer at 0.92 represent politicians and government officials respectively. The presence of two New York political figures at near-parity with major publishers suggests the audience that follows Harper Perennial overlaps substantially with a civically engaged, New York-oriented readership rather than a purely literary one.
The flat shape of this cluster points to an audience with consistent, broad affinities — one that doesn't concentrate sharply around any single neighbor type.