...中等级的方式提供，并且每一级提供固定的 计算规格（如内存分配，CPU 类型和速度等）；他们认为，每单位定价（Per-unit pricing）通常是用于数据传输或内存使用，也比分级定价灵活，因为它允许用户 根据他们自己的具体需求而定制自己的系统主内存分配；他们认为...
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That is a simple and elegant pricing structure that everyone understands, at a price-per-unit that investors can afford.
FORBES: ETFs Turn 20-Years Old in the U.S.
For authors and publishers, the agency model provides them with greater control over the timing of their promotions and higher per-unit earnings of 70% of the list price as opposed to 50% for the conventional wholesale pricing model.
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