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。

I have self-doubt. I have insecurity. I have nights when I show up at the arena and I’m like, ‘My back hurts, my feet hurt, my knees hurt. But, I just want to chill.’ We all have self-doubt. You don’t deny it, but you also don’t capitulate to it. You embrace it.

规模和价值效应在不同的市场和时间段中普遍存在。