Unpayable Interest: The Illusion of a Solvent Economy Loan Payoff Simulator
Before we begin, let’s ask a few simple questions.
📌 Is the aggregate economy solvent?
📌 Where does money come from?
📌 Can all debts be paid off, or is there something fundamentally wrong with the system?
Most people assume that if you borrow money and work hard, you can pay it back. But have you ever stopped to ask: Where does the money to pay the interest come from?
If every dollar in circulation was originally borrowed into existence, then money begins as debt. When interest is paid, purchasing power can shift from borrowers to bank equity. In a small closed model, the system can still “balance” on paper while the borrower runs out of spendable cash.
🔹 Borrowers can become insolvent even when aggregate balances still add up.
🔹 Interest payments can concentrate circulation into bank equity over time.
🔹 The key stress is often distribution (who holds liquidity), not just accounting totals.
This means the system can feel like musical chairs: claims remain, but the person who must pay may run out of money first.
💡 This simulator tests that pressure directly: can the borrower complete repayment using only the deposits available to them?
Even if Bob is perfectly responsible, he may still go broke before obligations are cleared.
👉 Let’s use a simple loan to see where the money ends up and who is left short. If the system is healthy for borrowers, Bob should be able to finish repayment without refinancing.
🚀 Let’s begin.
Alright , we're going to be borrowing from
, we have a problem. The terms of this scenario are that you can only pay off your loan with this loan. Don't just sit there, let's double down! I checked for you, and your credit is still good 😁
. are willing to give you another loan. So what do we do? Go back to your life of ignorance and bliss, or double down and pay off this loan?
Select Your Bank:
Ledger:
Metric
👤 Non-Bank Sector (Homer Simpson)?
Non-bank balance sheet. Deposits are spendable money. Debts are the borrower's obligations.
🏦 Banking Sector (Springfield National Bank)?
Bank balance sheet. Loans are bank assets. Interest payments first move into a bank liquidity bucket (bank-held deposits).
Closed Two-Actor Netting View?
Borrower + bank viewed together. Internal claims net out; useful as an accounting lens, but borrower cash stress is best seen in the borrower column.
Loans
?
Count of loan originations in this run (each new principal creation event).
0
0
0
Total Principal all time
?
Cumulative principal originated across all loans. This is a flow (history), not the current outstanding balance.
0
0
0
Outstanding Principal (Loan Balance)
?
Principal still owed right now (a stock). Mirrors between non-bank loan payable and bank loans receivable.
0
0
0
Cumulative Interest Charged
?
Cumulative interest accrued so far across the simulation (a flow). Interest is not created; it becomes payable over time.
0
0
0
Unpaid Accrued Interest
?
Interest owed as of now (a stock). Paying it transfers deposits from borrower to bank liquidity.
0
0
0
Borrower Debt Outstanding (Principal + Unpaid Interest)
?
Current borrower debt still owed to the bank. This excludes interest already paid and transferred.
0
0
0
Cumulative Interest Transferred to Bank (Paid)
?
Interest that has already been paid by the borrower and recognized by the bank.
0
0
0
Liquidity Lens (Borrower Deposits + Bank Liquidity)
?
Borrower column is borrower deposits. Bank column is bank liquidity bucket. System column is deposits held across both actors.
0
0
0
Liquidity Gap vs Borrower Debt Outstanding
?
Borrower column is the practical cash gap: borrower deposits minus borrower debt outstanding.
0
0
0
Borrower Solvency Ratio
?
Borrower Deposits / Total Obligation. Below 100% means borrower cannot fully settle obligations with current deposits.
0%
—
0%
Bank Liquidity Concentration Ratio
?
Bank Liquidity / Total Circulation. Higher values indicate more circulation concentrated on the bank side.
—
0%
0%
Loan
Loan Amount:
Interest Rate (% per year):
Term (years):
Bank Spend-Back (% of interest):
50%
Loan Repayment Schedule
Month
Actor
Action
Amount
Principal ($)
Interest ($)
Total paid($)
🏦 Loan account (bank, +)
👤 Loan account (borrower, +)
🏦 Bank liquidity bucket (+)
👤 Deposit account (borrower, +)
Obligation to pay ($)
Total Circulation ($)
0
Bank loan
Principal
0
0
0
0
0
0
0
0
Too late, you now know the truth and you cannot run from it.