Banks charge interest (I) which means that the total amount of money the so-called borrower (actual money creator) must pay the bank exceeds the Principal amount (P) created.
This is represented by the inequality P < (P + I).
This leads many people to believe that interest is the fundamental problem that makes the economic system mathematically unstable because "obviously" there isn't enough money created to pay both Principal and Interest.
The many variations of this stranded on a desert island fable purport to prove that interest is mathematically impossible to pay from the original principal alone.
Please follow this link if you continue to believe this misconception.
Here is an animated demonstration illustrating how a total of $1100 Principal + Interest can be paid back to the bank with just the original $550 Principal. Flow multiplies stock.
• The green line indicates the bank spending the interest back into circulation. This is the flow that allows the same money to be earned and paid again and again.
• The red flash is Principal being extinguished upon repayment to the bank.
RIgorous Attempt Proves Only the Obvious
They failed to prove anything but the obvious fact that UNPAID loans at interest grow exponentially.