>Borrowing money and the ability to pay it back depends on an economic system with future growth,
The common "argument" for this type of thinking is that if you borrow $100 and have to pay back $110, then in the future there has to be more money. This ignores the time value of (labor/money/invention...) as follows:
Fix money in the world at $200, owned by B (representing the external system to actor A).
A borrows $100 from B, owes $110 in a year. Now A,B = 100, 100
A then works (say even for B), earning $50 over the year, and used $40 to live on (spent wherever, say to B if you like). Now A has 100+50-40 = $110, B has 100-50+40 = $90.
Now A pays off B, returning the 110, and the state is back to start A,B = 0,200.
There is no need for more money to pay off interest, because time and labor and other things have value.
This articles uses this misunderstanding as proof for needing infinite growth then extrapolates to the system has to fail.
It's simply not true. Over the years I've had to explain this to many, many friends under the same thinking, and most of them get it and stop the "we need infinite growth!" mindset (at least for this type of argument).