According to the theory of optimal currency areas, a central fiscal policy is necessary because a single interest rate will not suit conditions in all parts of a currency zone.

根据最优货币区域理论，确立一个中央财政政策很有必要，因为单一利率并不适于货币区域内所有地区的情况。

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In the optimization of service policy for closed queuing networks, the method of optimizing policy that is based on single sample path of the systems is of practical interest.

在闭排队网络服务策略的优化中，基于对系统一条样本轨道的仿真进行策略优化是一种很有实用意义的方法。

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Europe's single monetary policy has also severed the link between short-term interest rates and economic performance in the euro area, says Mr Artus.

ECONOMIST: World economy

Because Europe's governments have signed away national control of interest rates, fiscal policy is the only tool to hand if the single monetary policy leaves their economies growing more slowly than they might, or faster than they can sustain without pressure on wages and property prices.

ECONOMIST: Europe grows apart

German interest rates really need to be lower, but since this is not possible under Europe's single monetary policy, common sense would argue that Germany should allow fiscal policy to be more flexible.

ECONOMIST: Germany stalls