3.1 Cash & Money Market Instruments

Cash & Money Market Instruments

Quick Summary: Money markets provide wholesale borrowing and lending for maturities up to one year, focusing on capital preservation and liquidity rather than capital growth. Key instruments include Treasury bills, commercial paper, certificates of deposit, and repurchase agreements. Following structural reforms, quotation-based benchmarks like LIBOR have been superseded by backward-looking, transaction-backed overnight Risk-Free Rates (RFRs) such as SONIA and SOFR, while European Money Market Funds operate under strict liquidity and valuation mandates.

---

1. The Role and Nature of the Money Market

The money market is not a single physical exchange; rather, it is an over-the-counter (OTC) wholesale financial market where governments, financial institutions, and major corporations manage short-term liquidity imbalances. By market convention, money market transactions have an original maturity of one year or less, with the vast majority of trades concentrated between overnight and three months.

Primary Economic Functions

1. Liquidity Management: Enables financial intermediaries and corporations with temporary surplus cash to earn interest while allowing entities experiencing short-term cash deficits to secure immediate funding.
2. Capital Preservation: Focuses on minimizing default and interest rate duration risk, making these instruments the closest substitutes for physical cash.
3. Monetary Policy Transmission: Acts as the direct channel through which central bank policy rates influence commercial bank lending rates, bond yields, and broader economic activity.

Wealth Management Context: Retail Cash vs. Wholesale Money Markets

In private wealth management, holding cash balances serves strategic purposes: establishing emergency reserves, funding planned liabilities, maintaining "dry powder" for opportunistic deployment, and derisking asset allocations during market distress.

However, wealthy individuals (HNWIs) face distinct counterparty risks when holding large cash sums in standard retail bank deposits. In most jurisdictions, statutory deposit protection schemes have strict monetary caps. For instance, the UK Financial Services Compensation Scheme (FSCS) guarantees deposits only up to £85,000 per eligible person per banking group, while the US Federal Deposit Insurance Corporation (FDIC) insures accounts up to $250,000 per depositor per institution. A private client holding £2,000,000 in an unsegregated commercial bank deposit carries concentrated unsecured credit exposure to that single institution. In contrast, money market instruments and institutional money market funds allow investors to diversify counterparty risk across sovereign issuers and multiple top-tier financial counterparties.

---

2. Core Money Market Instruments

Money market securities can be categorized into discount instruments (issued below par with no interim coupon) and interest-bearing instruments (issued at par with a stated coupon).

+-----------------------------------------------------------------------------------------+
|                              MONEY MARKET INSTRUMENTS                                   |
+-------------------------------------------+---------------------------------------------+
|           DISCOUNT INSTRUMENTS            |          INTEREST-BEARING INSTRUMENTS       |
|   (Issued at discount; redeem at Par)     |       (Issued at Par; pay interest)         |
+-------------------------------------------+---------------------------------------------+
| - Treasury Bills (T-Bills)                | - Negotiable Certificates of Deposit (CDs)  |
| - Commercial Paper (CP)                   | - Interbank Time Deposits                   |
| - Bankers' Acceptances (BAs)              | - Repurchase Agreements (Repos)             |
+-------------------------------------------+---------------------------------------------+

Treasury Bills (T-Bills)

Treasury bills represent short-term, direct sovereign debt obligations issued by national governments to finance day-to-day fiscal operations:

• Issuing Bodies: In the United Kingdom, T-Bills are issued by the UK Debt Management Office (DMO) on behalf of HM Treasury. In the United States, they are issued by the Department of the Treasury.
• Tenor and Auctions: Issued via competitive tenders with standard maturities of 1 month (28 days), 3 months (91 days), 6 months (182 days), and occasionally 12 months.
• Pricing Structure: T-Bills do not pay regular coupon interest. They are zero-coupon discount instruments, issued at a discount to nominal face value (par) and redeemed at 100 on maturity. The investor's return represents the capital difference between purchase price and par.
• Credit and Liquidity Profile: Backed by the taxing authority of the sovereign state, domestic currency T-Bills carry negligible credit default risk (viewed as the benchmark risk-free cash instrument) and trade in deep, highly liquid secondary markets.

Commercial Paper (CP)

Commercial paper is an unsecured, short-term promissory note issued by highly rated corporations, utilities, and financial institutions to meet working capital requirements, receivables financing, or seasonal inventory needs:

• Tenor: Highly customized, ranging from overnight up to 270 days in the US (to qualify for registration exemption under Section 3(a)(3) of the Securities Act of 1933) or up to 364 days in the Euro-Commercial Paper (ECP) market.
• Institutional Nature: Wholesale denominations typically exceed $100,000 or £500,000, catering exclusively to institutional asset managers, corporate treasuries, and money market funds.
• Credit Backstops: Because CP is unsecured, issuers must possess prime credit ratings (e.g., A-1/P-1/F1). Most non-bank corporate issuers secure committed revolving bank credit facilities (known as backstop lines of credit) to guarantee liquidity if market conditions prevent rolling over maturing paper.

Certificates of Deposit (CDs)

A Certificate of Deposit is a receipt issued by a commercial bank or building society acknowledging that a specified sum of money has been deposited for a fixed period at a specified interest rate:

• The Negotiability Feature: While traditional retail bank fixed-term deposits cannot be transferred and impose severe penalties for early withdrawal, wholesale CDs are negotiable. A negotiable CD can be freely sold by the holder into the secondary dealer market prior to maturity without altering the bank's deposit liability.
• Tenors and Rates: Standard maturities range from 1 month to 1 year (with some medium-term CDs extending to 5 years). Interest is paid either at maturity (for tenors <= 1 year) or semi-annually, structured as a fixed rate or pegged to an overnight reference rate.

Repurchase Agreements (Repos) and Reverse Repos

A Repurchase Agreement (Repo) is a transaction where one party sells a basket of high-quality securities (typically sovereign bonds) to an investor, while simultaneously agreeing to repurchase the identical securities at a predetermined future date and higher price.

$\text{Repo Cash Borrowed} \longrightarrow \text{Purchased Collateral Held} \longrightarrow \text{Repurchase at agreed price}$

• Economic Reality: A repo is legally a sale and repurchase, but economically it operates as a collateralized loan. The seller of the securities is borrowing cash; the buyer of the securities is lending cash against collateral.
• The Repo Rate: The annualized interest rate implicit in the difference between the sale price and the higher repurchase price.
• Haircut (Margin): To protect the cash lender against the market risk of the collateral dropping in value during the loan term, the collateral is discounted. For example, if a borrower pledges £102 million of government bonds to borrow £100 million in cash, the haircut is 2%.
• Reverse Repo: The mirror image of the transaction viewed from the cash lender's perspective (buying securities today with the agreement to resell them at the agreed future date). Central banks use repos and reverse repos as their primary open-market tool to regulate liquidity in the banking system.

---

3. Comparison of Core Money Market Instruments

---

4. Benchmark Interest Rates: The Transition from LIBOR to Risk-Free Rates

For nearly four decades, the London Interbank Offered Rate (LIBOR) served as the global benchmark for financial contracts, underpinning hundreds of trillions of dollars in mortgages, loans, floating rate notes, and derivatives. Administered across five currencies and seven tenors, LIBOR reflected the rate at which major international panel banks estimated they could borrow unsecured funds in the London interbank market.

The Structural Breakdown of LIBOR

Following the 2008 global financial crisis, LIBOR exhibited severe vulnerabilities:

1. Expert Judgment vs. Actual Trades: Due to post-crisis capital regulations and risk aversion, unsecured interbank term lending dried up. Consequently, panel banks based submissions on subjective estimates ("expert judgment") rather than observable transactions.
2. Manipulation Scandals: Regulatory investigations in 2012 uncovered widespread fraudulent collusion among panel traders who altered submissions to profit proprietary derivative books or mask balance sheet distress.
3. Run Risk and Fragility: In stressed markets, the lack of underlying transaction data caused LIBOR to disconnect from real borrowing costs.

The Adoption of Alternative Overnight Risk-Free Rates (RFRs)

The global Financial Stability Board (FSB) mandated the phase-out of LIBOR by the end of 2021 (with select USD tenors ceasing in June 2023). In its place, international regulators established Near Risk-Free Reference Rates (RFRs), characterized by transparent, transaction-based methodologies anchored in robust overnight lending markets:

+---------------------------------------------------------------------------------------+
|                   GLOBAL RISK-FREE REFERENCE RATES (RFRs)                             |
+---------------------------------------------------------------------------------------+
|  Currency  | Benchmark  | Full Name                             | Collateral / Mechanism      |
+------------+------------+---------------------------------------+-----------------------------+
|  GBP (£)   | SONIA      | Sterling Overnight Index Average      | Unsecured overnight trades  |
|  USD ($)   | SOFR       | Secured Overnight Financing Rate      | Secured US Treasury repos   |
|  EUR (€)   | €STR       | Euro Short-Term Rate                  | Unsecured overnight trades  |
|  JPY (¥)   | TONA       | Tokyo Overnight Average Rate          | Unsecured overnight trades  |
|  CHF (Fr)  | SARON      | Swiss Average Rate Overnight          | Secured Swiss repo market   |
+------------+------------+---------------------------------------+-----------------------------+

• SONIA (GBP): Administered by the Bank of England. It is the volume-weighted average of unsecured overnight deposit transactions exceeding £25 million across the sterling wholesale market.
• SOFR (USD): Administered by the Federal Reserve Bank of New York. It measures the cost of overnight cash borrowing secured by US Treasury securities across multiple repo segments, processing over $1 trillion in actual daily transactions.
• €STR (EUR): Administered by the European Central Bank (ECB), measuring wholesale unsecured overnight borrowing costs for euro-area credit institutions, replacing EONIA.
• Compounding in Arrears: Unlike LIBOR, which was a "forward-looking" term rate known at the beginning of an interest period (e.g., a 3-month rate set on day one), RFRs are overnight rates. Floating coupons using RFRs are calculated by compounding overnight rates in arrears over the period, accurately capturing real financing conditions.

---

5. Money Market Funds (MMFs) & the European Regulatory Framework

Money Market Funds are open-ended collective investment schemes that invest in high-grade short-term debt instruments. They offer retail and institutional investors diversified access to wholesale cash markets while targeting liquidity and capital stability.

Run Risk and the 2017 Regulatory Reform

During financial stress (such as the collapse of Lehman Brothers in 2008 and the pandemic shock of March 2020), certain prime MMFs experienced massive investor redemptions. When a fund's market value fell below its fixed redemption price—a phenomenon known as "breaking the buck"—investors rushed to redeem before assets were liquidated at fire-sale prices.

To eliminate structural run incentives, the European Union implemented the European MMF Regulation (EU 2017/1131), establishing three tightly regulated fund models:

---

6. Money Market Yield Calculations

Money market instruments are priced and quoted using two different conventions: the bank discount basis and the money market yield (or investment yield) basis.

1. Bank Discount Yield ($d$)

Used by market convention for quoting Treasury bills and commercial paper, this formula expresses the return as an annualized percentage of the nominal face value using an assumed 360-day year:

$d = \frac{F - P}{F} \times \frac{360}{t}$

Where:

• $F$ = Face (par) value
• $P$ = Purchase price
• $t$ = Days to maturity

2. Money Market Yield ($y_{\text{mm}}$) / CD Equivalent Yield

Because the bank discount formula divides by face value ($F$) rather than the capital actually outlayed ($P$), it systematically understates the true rate of return earned by the investor. To make discount instruments comparable to interest-bearing CDs, analysts compute the money market yield:

$y_{\text{mm}} = \frac{F - P}{P} \times \frac{360}{t}$

Alternatively, it can be derived directly from the discount yield ($d$):

$y_{\text{mm}} = \frac{360 \times d}{360 - (d \times t)}$

3. Bond Equivalent Yield ($y_{\text{BEY}}$)

To compare a money market instrument directly against an annual or semi-annual coupon-paying bond that uses a 365-day year (such as UK Gilts), the calculation is adjusted for actual calendar length:

$y_{\text{BEY}} = \frac{F - P}{P} \times \frac{365}{t}$

Worked Example: T-Bill Pricing & Returns

An investor purchases a 91-day UK Treasury bill with a face value of £1,000,000 for £988,000.

1. Bank Discount Yield: $d = \frac{£1,000,000 - £988,000}{£1,000,000} \times \frac{360}{91} = \frac{£12,000}{£1,000,000} \times 3.956 = 0.012 \times 3.956 = 4.747\%$

2. Money Market Yield (CD Equivalent): $y_{\text{mm}} = \frac{£12,000}{£988,000} \times \frac{360}{91} = 0.012146 \times 3.956 = 4.805\%$

3. Bond Equivalent Yield (365-day basis): $y_{\text{BEY}} = \frac{£12,000}{£988,000} \times \frac{365}{91} = 0.012146 \times 4.011 = 4.872\%$

Notice the progression: $d < y_{\text{mm}} < y_{\text{BEY}}$. The bank discount yield is the lowest because it uses par in the denominator and 360 days; the bond equivalent yield is the highest and most accurate reflection of annualized economic return.

---

Negative Interest Rates

The ICWIM syllabus explicitly requires candidates to know the key features of cash and bonds including negative interest rates — a regime that ceased to be a theoretical curiosity when the European Central Bank cut its deposit facility rate below zero in June 2014 and the Swiss National Bank, Bank of Japan, Riksbank and Danmarks Nationalbank followed.

What a negative rate actually means. The depositor pays the borrower for the privilege of lending. A €10,000,000 deposit at −0.50% for one year returns €9,950,000. Prices invert accordingly: a short-dated bill issued at a negative yield trades above par, and its holder books a guaranteed nominal loss if held to maturity.

Money market funds under negative rates. European money market funds facing sub-zero yields historically used a share cancellation mechanism to preserve a constant net asset value, cancelling a proportion of an investor's units instead of marking the price below par. Under the EU Money Market Fund Regulation, a Low Volatility NAV fund may not use a constant price at all if its shadow NAV deviates by more than 20 basis points, which forces variable pricing in a sustained negative-rate environment.

Negative policy rates were unwound across Europe and Japan between 2022 and 2024, but the exam still tests the mechanics because they define the lower boundary of the interest-rate cycle a wealth manager must plan around.