It's stuff, but most importantly, food and shelter. It's the thing that builds places to live and claws calories out of the ground. When the economy grinds to a

It's stuff, but most importantly, food and shelter. It's the thing that builds places to live and claws calories out of the ground. When the economy grinds to a halt people start to go hungry. (People do go hungry anyway. We often do kind of a bad job feeding everyone, considering the enormous technological and logistical resources available now, but that's a historical anomaly)