An economy built on infinite growth while remaining within the confines of our planet is not sustainable. There comes a point where you just can't make enough money to support the debt required to improve businesses and economies further.
You wanna know how you can built an economy built on constant growth? Get out of a small, finite system we are outgrowing and get to space. Fixing our issues on Earth without moving towards the stars will fuck us in the long run, and getting everyone out of poverty just increases the drain on already low resources. Get to space, get fusion working, mine helium, water, etc., and bring them back. Make colonies. That is the only way to sustain such an economy.
Well, we aren't even sure if we've been on the moon. So building colonies on other planets is somewhat far away. However we cannot even make a dollar truly digital, so if we were to transact in between planets, we wouldn't use dollars. There is just no way. It would be a shame exploring space while we're still stuck within so primitive monetary system.
All the funny shit is going to happen once we remove physical cash and make everything bank based, with negative interest rates. It's like forcefully trying to pump the economy into gear. But no matter what we do, we're just raising the debt limit. Noone can and will pay back the debt. Ever.
Related to negative interest rates-
Paradox of thrift