It turns out that for most objects, the direct garbage collection cost is — zero.

对于多数对象来说，直接垃圾收集的成本为零。

youdao

Two ThreadMXBean metrics are also an option but can have limited usefulness and a slightly higher collection cost.

还有两个ThreadMXBean指标可以选择，但它们的作用有限，而且收集成本会高一些。

youdao

A fundamental purpose for tax payment service system is to reduce the overall social cost, which consists of tax payment cost and tax collection cost.

其目标是使由纳税成本和征税成本构成的社会总成本最低。

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What fascinates me about this is that the story illustrates the basic economic problem that all recycling faces: the cost of collection.

FORBES: The Cash4Gold Bankruptcy: This Is The Basic Problem With Recycling

And your collection mechanism has to cost you less than the additional value you get by having more material at the end of it.

FORBES: The Cash4Gold Bankruptcy: This Is The Basic Problem With Recycling

The lack of a coordinated, low-cost and convenient collection system has made it difficult to implement effective recycling programs for consumer electronics.

FORBES: EcoATM Turns E-Waste into Cash