Certainly one day the system will be unsustainable. You can sustain growth for a little while with a stable population by increasing consumption, but once the s

Certainly one day the system will be unsustainable. You can sustain growth for a little while with a stable population by increasing consumption, but once the succeeding generations have the same number of buyers or fewer, it becomes very challenging to find new dollars to buy more goods. As to your question about the snap... 3.5 billion would be an economic disaster and because people have fewer children it would take forever to rebuild that wealth.