在目前全球经济收缩情况下，一国财政刺激的外溢效应会非常大，所以，很少有国家去实行刺激计划。
When the global economy is contracting like now, the leakage from one's fiscal stimulus is very large. Hence, few economies are incentivized to stimulate.
生态环境产品具有利益外溢的特点，财政手段可以有效解决生态环境外部效应问题。
Ecological products have the characteristics of profit outflowing. Financial means can be adopted to solve the problem of external effects of ecological environment.
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