Productivity is indeed a second order thing in the way the banking system works now. But you still have not understood my point.

As long as IT IS LEGAL for banks to create credit for non-productive existing-asset purchases, there is a limit to infinity function applied to the economy that leads to consolidation of all assets with ex nihilo money. The banking system as it exists now leads to a future where one hypothetical private equity firm will have purchased all assets in the economy with bank created money (in practice, it will simply be government/central bank ownership).