No, Your Bank Doesn't Actually Multiply Your Money 9 Times
5 min read
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5 min read
You have probably seen the claim: deposit Rp1,000,000 at a bank, and the banking system can turn it into roughly Rp10,000,000 through a chain of relending. It sounds alarming, like your money is being secretly cloned. It also happens to be a simplified textbook model that central bank researchers, including the Bank of England, have publicly said does not describe how banks actually create money.
That does not mean nothing interesting is happening when you deposit money. It means the real mechanism is different, and arguably more useful to understand than the multiplier story.
The "money multiplier" model most people encounter says this: a bank must hold a fraction of each deposit as a reserve (in Indonesia, the Giro Wajib Minimum, or GWM, set by Bank Indonesia), lend out the rest, and when that loan gets deposited at another bank, the process repeats.
New money created ≈ Initial deposit ÷ Reserve requirement
This model is genuinely taught in economics courses, and it is not fabricated. Its problem is the direction of causation. It assumes banks wait for deposits and reserves before they lend. In a widely cited 2014 paper, Bank of England researchers stated plainly that this is a popular misconception: banks do not simply act as intermediaries lending out deposits savers place with them, and they do not "multiply up" central bank reserves to create new loans.
When a bank approves a loan, it credits the borrower's account with the loan amount. That credit is a deposit, and it exists the moment the loan is booked, not after a chain of separate depositors passes money along. In this sense, commercial banks create most of the money in a modern economy simply by lending, subject to real constraints: their own capital requirements, their assessment of whether the loan will be repaid, and liquidity rules like GWM that they must satisfy afterward, not beforehand.
This matters because it changes what actually limits how much banks lend. It is not a fixed multiplier ticking upward with each deposit. It is capital adequacy, credit risk appetite, and monetary policy, primarily interest rates set by the central bank, that BI adjusts specifically to influence how much banks are willing to lend.
If GWM is not the mechanism that "multiplies" deposits, what is it for? It is a liquidity and monetary policy tool, not a speed limit on money creation. Bank Indonesia has adjusted it directly for that reason. Under Peraturan Anggota Dewan Gubernur No. 24/8/PADG/2022, the rupiah GWM for conventional commercial banks rose from 6.0% to 7.5% effective 1 July 2022, then to 9.0% effective 1 September 2022, with a parallel increase for Islamic banks from 4.5% to 7.5% over the same period.
| Bank type | GWM before | GWM from 1 Jul 2022 | GWM from 1 Sep 2022 |
|---|---|---|---|
| Conventional commercial banks | 6.0% | 7.5% | 9.0% |
| Islamic banks / units | 4.5% | 6.0% | 7.5% |
BI continues to adjust GWM as part of its broader liquidity policy, most recently under Peraturan Bank Indonesia No. 6/2025 on liquidity management. The specific figure moves. What it is for does not: managing system-wide liquidity, not capping how much of "your" specific deposit gets relent.
No, and this part is well established. Lembaga Penjamin Simpanan (LPS) guarantees deposits up to Rp2,000,000,000 per depositor per bank, provided three conditions widely known as "3T" are met: the deposit is recorded (Tercatat) in the bank's books, the depositor did not receive interest exceeding the rate LPS sets as reasonable (Tingkat bunga), and the depositor was not involved in actions that caused the bank a loss (Tindakan). Money being lent out through the normal course of a bank's business is exactly the business LPS exists to backstop.
Here is the actually useful takeaway, separate from whether the multiplier number is 9x or something else: a bank tracks its own numbers, capital, reserves, loan book, with precision, every single day. Most people do not track the equivalent number for themselves.
That number is your net worth: everything you own minus everything you owe. Bank Indonesia adjusts GWM and its policy rate deliberately, using real data, to manage the financial system. You can apply the same discipline to your own finances by knowing your actual position rather than just your account balance. NetWort tracks the current BI rate alongside eight other macro indicators, so you can see the policy backdrop your own savings and debt sit inside, rather than relying on a secondhand explanation of how the system works.