The numerical examples show that, with the application of these global optimization methods, an average-cost problem is the limitation of a discounted problem as the discount factor goes to zero.

数值例子说明，全局优化方法保证了平均准则和折扣准则下的计算结果之间当折扣因子趋近于零时的极限关系成立。

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However, during 2008, Twitter's user population was largely American, so this factor alone does not entirely discount the study.

然而，在2008年，推特的用户大都是美国人，因此从这方面来看不影响研究结果。

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The actuarial formula of pure premium of the whole life insurance is discussed, as discount factor is random.

在贴现因子为随机的条件下，给出终身寿险纯保费的精算公式。

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But the biggest factor, by far, is whether discount airlines fly in a market.

WSJ: Decoding Airline Ticket Costs