Stanford economist @pawtrammell reveals the scenario where GDP growth is zero even during a full technological singularity with Dyson spheres and immortality: "The simplest case of this would be the case in which people value the human touch. Or they value something else that's not exploding in quantity, like historical artifacts or natural beaches." "Every time the quantity of everything else doubles, its price relative to a human massage or a natural beach falls by more than half. The GDP…