Amazon takes this philosophy to heart, focusing most of its effort on leading indicators (we call these “controllable input metrics”) rather than lagging indicators (“output metrics”). Input metrics track things like selection, price, or convenience—factors that Amazon can control through actions such as adding items to the catalog, lowering cost so prices can be lowered, or positioning inventory to facilitate faster delivery to customers. Output metrics—things like orders, revenue, and profit—are important, but they generally can’t be directly manipulated in a sustainable manner over the long term. Input metrics measure things that, done right, bring about the desired results in your output metrics.

Colin Bryar and Bill Carr – Working Backwards