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

WSJ: Decoding Airline Ticket Costs