It's pretty hard to make an economy based on credit and compounding interest to work without continued economic growth.
Perhaps an economy does not need to be based on credit and compounding interest.
Yes, but tfa is asking, "what are the reasons you want that economic growth?"
Because if growth per caoita happens at a higher rate than inflation per capita the average amount of stuff per capita increases over time, which increases the likelihood of everyone being better off (i.e economic growth is why a poor person in the west today has a surprising amount of consumer goods and a full belly today rather than the real poverty of that same person 200 years ago)