Are you suggesting that economics is primarily concerned with compounding interest?
my point about compound interest is that it is a major mechanism that prevents equitable redistrubution of resources, and is thus a factor in making economics (as it stands) bad at resource allocation.
"The model is a work of fiction based on the tacit and false assumption of frictionless barter. Attempting to apply such microeconomic foundations to understand a monetary economy means that mistakes in reasoning are inevitable." (p.239)
Later.