Why is the textbook fractional reserve money multiplier an economic myth?

Textbooks teach that commercial banks take deposits, retain a mandatory reserve fraction (e.g., 10%), and lend out the remaining 90%. In modern central banking, this is false. Commercial banks do not lend out central bank reserves or customer deposits. When a bank originates a loan, it simultaneously creates a brand-new asset (the loan) and a brand-new liability (a freshly minted demand deposit) on its balance sheet. Bank lending creates deposits out of thin air. Furthermore, the Federal Reserve reduced reserve requirement ratios to 0.00% across all depository institutions in March 2020.

What is the difference between Base Money and Bank Credit Money?

Base Money (M0 or Monetary Base) consists of liabilities of the central bank: physical paper currency in circulation and electronic reserve balances held by depository institutions on Fedwire. Central bank reserves never circulate in the real economy; they are strictly interbank settlement tokens. Bank Credit Money (M1 and M2 demand deposits) consists of liabilities of commercial banks. When non-bank businesses and households conduct transactions, they transfer commercial bank deposits, which are claims on base money.

How does the Treasury General Account (TGA) drain systemic liquidity?

The Treasury General Account is the federal government's primary operating checking account held directly at the Federal Reserve. When taxpayers remit income taxes to the IRS or investors purchase freshly issued Treasuries from dealers, customer bank deposits decrease, and commercial bank reserves at the Fed are debited and credited to the TGA. Because bank reserves are drained from commercial banks into the government's account, Net Liquidity falls, tightening private financial conditions until the Treasury spends the funds back into the banking system.

How does the Overnight Reverse Repo Facility (ON RRP) sterilize Quantitative Tightening?

When the Treasury issues Treasury bills, Money Market Funds (MMFs) often reallocate cash out of the Fed's ON RRP facility into higher-yielding T-bills. When an MMF buys a T-bill, cash is debited from the Fed's ON RRP liability and credited to the Treasury's TGA liability. Throughout this transaction, commercial bank reserves are completely untouched. This allowed the Federal Reserve to shrink its balance sheet by over one trillion dollars in 2023 without causing a contraction in commercial bank reserves or tightening bank credit.

How does the Fed's Ample Reserves Floor System function?

In an ample reserves regime, the banking system holds trillions of dollars in excess reserves. The Fed no longer controls short-term rates by adjusting reserve supply; instead, it uses administered rates. The Interest on Reserve Balances (IORB) rate acts as the policy target anchor for commercial banks. The Overnight Reverse Repo (ON RRP) rate acts as a sub-floor available to non-banks like Money Market Funds and GSEs who cannot earn IORB. The Standing Repo Facility (SRF) acts as a ceiling, providing cash against Treasuries if repo rates spike.

What is the U.S. Dollar Net Liquidity formula and why do macro desks track it?

The standard Net Liquidity formula is calculated as: Fed Total Assets (WALCL) minus the Treasury General Account (WTREGEN) minus the Overnight Reverse Repo Facility (RRPONTSYD). Net Liquidity represents the effective dollar liquidity buffer available to the commercial banking sector. Institutional macro desks monitor this metric because weekly expansions and contractions in Net Liquidity exhibit strong positive statistical correlation with equity valuation multiples and credit risk premia.

Home > Financial Tools & Institutional Desks > Macro & Systemic Risk > Central Bank Plumbing & Money Creation

Central Bank Plumbing, Balance Sheet T-Accounts & Money Creation Simulator

The non-textbook institutional framework of modern central banking and monetary architecture. Models the four balance sheets (Federal Reserve, U.S. Treasury, Commercial Banks, and Non-Bank Financial Intermediaries), proving how commercial bank loans create deposits, how the Treasury General Account (TGA) drains systemic liquidity, how Overnight Reverse Repo (ON RRP) sterilizes Quantitative Tightening, and how the ample reserves floor system anchors policy rates.

Endogenous Money Creation 4-Balance-Sheet T-Accounts Ample Reserves Floor System U.S. Dollar Net Liquidity

1. Institutional Balance Sheet Transaction Sandbox

8 OPERATIONAL SCENARIOS

Select an institutional scenario below to simulate the simultaneous double-entry balance sheet adjustments across the Federal Reserve, U.S. Treasury, Commercial Banking Sector, and Non-Bank Public.

Federal Reserve (Central Bank)

Monetary Authority • Fedwire Clearinghouse

Net: $0.0B

Assets (SOMA & Loans) $6,850B

U.S. Treasuries $0

MBS / Agency Debt $0

Discount Window / SRF $0

Liabilities (Base Money) $6,850B

Bank Reserve Balances $0

Treasury General Account (TGA) $0

Overnight Reverse Repo (ON RRP) $0

Currency in Circulation $0

U.S. Department of the Treasury

Fiscal Agent • Sovereign Issuer

Net: $0.0B

Assets (Cash Buffer) $800B

Operating Cash in TGA (at Fed) $0

Commercial Bank Tax Accounts $0

Liabilities & Equity $35,200B

Treasury Bills (Short-Term) $0

Treasury Notes & Bonds (Coupons) $0

Fiscal Equity / Net Surplus $0

Commercial Banking Sector

Depository Institutions • Primary Dealers

Net: $0.0B

Assets (Reserves & Loans) $23,500B

Reserves at Federal Reserve $0

Commercial & Industrial Loans $0

Treasury & Agency Securities $0

Liabilities (Bank Money) $23,500B

Customer Demand Deposits (M1/M2) $0

Wholesale Repo & Fed Advances $0

Bank Capital / Equity $0

Non-Bank Public & MMFs

Households • Corporations • Shadow Banking

Net: $0.0B

Assets (Broad Money & Notes) --

Commercial Bank Deposits $0

Money Market Fund Shares $0

Treasury Securities Held $0

MMF Cash in Fed ON RRP $0

Liabilities & Net Worth --

Bank Debt & Credit Facilities $0

Tax Liabilities / Equity $0

Institutional Takeaway: Endogenous Credit Creation

When a commercial bank originates a loan, it creates new purchasing power without touching central bank reserves. The bank simply credits the borrower's demand deposit account. Reserves are only utilized later if the customer wires funds to a different banking institution.

Net Liquidity Impact

$0.0B

Broad Money (M2) Impact

+$10.0M

2. The Federal Reserve Administered Rates Corridor (Floor System)

The operational architecture governing policy rate transmission under an ample reserves regime.

AMPLE RESERVES REGIME

Upper Ceiling

Primary Credit (Discount Window)

4.50%

Penalty emergency lending rate for depository institutions. Sets upper ceiling on unsecured rates.

Secured Ceiling

Standing Repo Facility (SRF)

4.50%

Provides overnight cash against Treasuries/MBS to primary dealers and banks to cap repo spikes.

Policy Anchor

Interest on Reserve Balances (IORB)

4.40%

The anchor rate paid to commercial banks on all reserve balances held on Fedwire.

Market Equilibrium

EFFR & SOFR

4.33% / 4.31%

Actual volume-weighted median interbank market clearing rates (unsecured and secured).

Sub-Floor

Overnight Reverse Repo (ON RRP)

4.25%

Floor rate available to non-banks (Money Market Funds, GSEs) ineligible to receive IORB.

Corridor Spread Telemetry: EFFR − IORB: −7.0 bps (Ample Reserves)

SOFR − ON RRP: +6.0 bps (Healthy Dealer Demand)

3. Real-Time U.S. Dollar Net Liquidity & Reserve Adequacy Runway

Formula: Fed Total Assets (WALCL) − Treasury General Account (WTREGEN) − Overnight Reverse Repo (RRPONTSYD)

LIVE FRED INGESTION

U.S. Dollar Net Liquidity

$5,750B

Core commercial bank liquidity buffer. Key macro driver of equity valuations.

Fed Total Assets (WALCL)

$6,850B

Total SOMA securities and loans. Quantitative Tightening runoff balance.

Treasury General Account (TGA)

$800B

Government operating cash at the Fed. Weekly swings drain bank reserves.

Overnight Reverse Repo (ON RRP)

$300B

Excess cash parked by Money Market Funds. Cushioned the impact of Fed QT.

Bank Reserve Adequacy (Lorie Logan Minimum Comfortable Threshold) AMPLE RESERVES (11.8% of GDP)

Scarce (< 8% GDP / $2.3T) Transition Buffer (9%–10% GDP) Ample / Abundant (> 11% GDP / $3.2T)

4. The Hierarchy of Money: Base Money vs. Bank Credit Money

Perry Mehrling's "Money View" layered structure of modern credit and settlement.

Tier 1: Central Bank Base Money (M0 / Monetary Base)

Liabilities of the Federal Reserve: Bank Reserves on Fedwire and Physical Currency. Ultimate settlement tokens. Never circulate among the public.

$5,520 Billion

Reserves ($3.22T) + Currency ($2.30T)

Tier 2: Commercial Bank Credit Money (M1 & M2 Broad Money)

Liabilities of commercial banks: Demand deposits and savings deposits. Created endogenously when commercial banks approve loans. Used by households and non-financial businesses.

$21,450 Billion

Commercial Bank Demand Deposits

Tier 3: Shadow Banking Money & Wholesale Collateral

Liabilities of non-bank financial intermediaries: Money Market Fund shares, Treasury Repurchase Agreements (Repo), and Commercial Paper. Claims on bank deposits.

$6,480 Billion

Institutional MMF Assets & Repo

5. Institutional Methodology & Mathematical Foundations

1. The Death of the Fractional Reserve Money Multiplier

Standard economics textbooks continue to teach the fractional reserve banking model, which posits that central banks control the money supply by injecting reserves, which commercial banks multiply according to the formula:

Textbook Myth: Broad Money (M) = Central Bank Reserves (R) × (1 / Reserve Requirement Ratio)

In the real financial system, this model is completely inverted. As established by the Bank of England (2014) and the Federal Reserve Bank of New York:

Loans Create Deposits: When a commercial bank extends a loan, it does not transfer money from an existing depositor, nor does it lend out central bank reserves. It creates a brand-new deposit liability matching the loan asset.
Reserves are Settlement Tokens: Central bank reserves exist purely for interbank clearing on Fedwire. Reserves cannot leave the Federal Reserve system; a bank cannot loan reserves to a corporation or retail borrower.
Zero Reserve Requirement: On March 26, 2020, the Board of Governors of the Federal Reserve reduced reserve requirement ratios to 0.00% for all depository institutions, officially rendering the textbook multiplier mathematically meaningless.

2. The Triangular Balance Sheet Mechanics of Fiscal Flows

The relationship between the U.S. Treasury and the Federal Reserve is governed by Section 14 of the Federal Reserve Act, which prohibits the Fed from directly purchasing newly issued debt from the Treasury. All issuance must be intermediated by Primary Dealers:

Net Systemic Liquidity = Fed Total Assets − Treasury General Account − Overnight Reverse Repo

When taxpayers pay taxes to the IRS on quarterly filing dates, money travels from commercial bank demand deposits into the Treasury General Account (TGA) at the Fed. This requires commercial banks to surrender an equal volume of Fedwire reserves. Consequently, Tax Day is a systemic liquidity drain that pulls cash out of the banking sector. Conversely, when the Treasury spends cash from the TGA, reserves are re-credited to commercial banks, expanding private market liquidity.

3. How Money Market Funds Sterilized Quantitative Tightening

During the 2022–2024 Quantitative Tightening (QT) cycle, the Federal Reserve allowed up to $95 billion per month in Treasuries and MBS to roll off its balance sheet. Under orthodox theory, this should have caused a severe contraction in commercial bank reserves.

However, because the Treasury heavily weighted its borrowing toward short-term Treasury bills, Money Market Funds (MMFs) withdrew cash from the Fed's Overnight Reverse Repo Facility (ON RRP) to buy T-bills. As a result, the liability side of the Fed's balance sheet shifted from ON RRP to TGA, leaving commercial bank reserves completely insulated from the contraction.

Frequently Asked Questions

Why did the Fed switch from a corridor system to a floor system in 2008? +

Prior to the 2008 Global Financial Crisis, the Federal Reserve operated in a scarce reserves regime where the total banking system held only $10B to $20B in reserves. In that regime, small adjustments in reserve supply shifted the fed funds rate. However, during the crisis, the Fed executed Quantitative Easing (QE), flooding the banking system with trillions of dollars in excess reserves. In an environment with massive excess liquidity, open market operations could no longer control rates. Congress authorized the Fed to pay Interest on Reserve Balances (IORB), establishing the current floor system where administered rates anchor the market.

What causes repo market crises like the September 2019 spike? +

In September 2019, the Secured Overnight Financing Rate (SOFR) spiked to nearly 10% intraday. This occurred due to a collision of three factors: (1) Corporate quarterly tax payments drained $35B of bank reserves into the TGA, (2) Treasury debt auction settlements absorbed an additional $78B, and (3) Post-crisis liquidity regulations (LCR and G-SIB capital surcharges) prevented the four largest commercial banks from lending their remaining reserves into the repo market. In response, the Fed launched the Standing Repo Facility (SRF) to act as a permanent backstop ceiling.

What is the minimum comfortable level of reserves (MCLOR)? +

Dallas Fed President Lorie Logan and Fed researchers define MCLOR as the threshold below which bank reserves become scarce rather than ample. If reserves fall below approximately 10% to 11% of U.S. nominal GDP (~$3.0 trillion to $3.3 trillion), banks begin hoarding cash to meet intraday daylight overdraft limits and regulatory stress-testing requirements, causing interbank rates (EFFR) to rise above the IORB target anchor.