These two costs exist trade-off relation each other.

库存成本和运输成本之间又存在交替损益的关系。

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Once a worker makes enough to cover their basic needs, their perception shifts from what the amount allows them to physically purchase to social reference points like the work-life trade-off and where they stand in relation to their peers.

FORBES: Unhappy With Your Paycheck? Expect More Work-Family Conflict