快餐业的中层管理长期被挤压。员工流动率高（美国快餐业年均员工流动率超过 100%），培训周期被压缩到最短，门店经理自己的薪酬和职业发展空间有限，留不住有经验的人。结果就是：管理能力的系统性缺失。不是某一家店的经理不行，而是整个行业的结构决定了它很难持续拥有足够好的中层管理。
returns. We target a ~5% spend rate, typical for
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else this.#data.set(key, new LWWRegister(this.id, remote));，详情可参考夫子
Naturally this approach requires a bit more work on the User’s part: if there are M users on the banned list, then every User must do about M extra pieces of work when Showing their credential, which hopefully means that the number of banned users stays small.