> Increasing unsustainability leads to price increases Not if there is nobody alive anymore to raise prices. This theory works well for progressive change but

> Increasing unsustainability leads to price increases Not if there is nobody alive anymore to raise prices. This theory works well for progressive change but doesn't hold for long-term brutal changes, e.g. maybe historically if people dried the only well in their village there was no price increase (or there was an instantaneous price increase to infinity if you prefer) because the village was doomed.