Hmmm the money for growth loans can come primarily from consumption loans and from failed growth loans. BUT, the demand for loans increases with consumption loans. So, growth loans need to pay 'consumption loan' premium. All growth loans end up shooting for the interest rate, instead of the actual growth rate (e.g., you take out a growth loan if you expect to beat 5%, when in truth society only averages 2%)
Now, if interest rates fell to the growth rate, then it should be infinitely sustainable. You can end up borrowing money to buy an apple tree and then sell me the apples using the money I borrowed to make a pie-making company.
The consumption loans then add liquidity. But, this liquidity comes at the price of growth enterprises only starting if they feel they can beat the 'consumption loan premium' increase in debt costs.
Now, if interest rates fell to the growth rate, then it should be infinitely sustainable. You can end up borrowing money to buy an apple tree and then sell me the apples using the money I borrowed to make a pie-making company.
The consumption loans then add liquidity. But, this liquidity comes at the price of growth enterprises only starting if they feel they can beat the 'consumption loan premium' increase in debt costs.