" A standard impulse when there is a lot to do is to pack tightly-- as tightly as possible, to fit everything in. And when you are not tightly packed, there's a feeling that perhaps you are not doing enough...You have undervalued slack. The slightest glitch imposes an obligation you can no longer afford, and borrowing from tomorrow's budget comes at high interest. "

― Sendhil Mullainathan , Scarcity: Why Having Too Little Means So Much