The most dangerous phrase in the language is, "We've always done it this way."
最优财政政策要求税收随时间平滑,因为突然的变化会扭曲经济决策。
The present state of the system of nature is evidently a resultant of what it was in the preceding moment, and if we conceive of an intelligence which at a given instant comprehends all the relations of the entities of this universe, it could state the respective positions, motions, and general effects of all these entities at any time in the past or future.