Professor Jessie

How Funds Flow Through the Economy

Have you ever wondered how your savings account deposit ends up funding someone's mortgage? Or how a startup gets millions from investors it has never met? The answer lies in the financial system — the vast network of markets and institutions that channels money from those who have surplus capital to those who need it.

The Big Picture

Investors' funds flow through financial markets like the New York Stock Exchange and the mortgage market. But markets don't operate in isolation — they're connected and supported by financial institutions that act as intermediaries. Commercial banks (like Bank of America), investment banks (like Morgan Stanley), and mutual funds (like Fidelity) all serve as bridges, moving capital from individual savers to businesses and governments that need it.

This chapter answers two fundamental questions: How do funds move through the economy? and How do financial markets and institutions work together to make that happen?

Financial Markets: Two Key Dimensions

Financial markets are the arenas through which funds flow. To understand them, we classify markets along two major dimensions — and every market falls into one category on each axis.

For example, when a company issues new stock for the first time (an IPO), that's a primary capital market transaction. When you later buy shares of that stock on the NYSE from another investor, that's a secondary capital market transaction. When a corporation issues 90-day commercial paper, that's a primary money market transaction.

Primary Markets: Where New Capital Is Raised

Primary markets are where corporations and governments raise fresh capital by issuing new securities. When a company needs money for a new factory, an expansion, or debt refinancing, it turns to the primary market to sell stocks or bonds directly to investors.

How It Works

Corporations rarely sell new securities directly to the public themselves. Instead, they hire investment banks — specialized financial firms that help companies and governments raise capital. Major investment banks include Morgan Stanley, Goldman Sachs, and others. These banks underwrite the offering: they assess demand, set the price, and often purchase the securities from the issuer to resell to investors, absorbing the risk that the securities might not sell.

Initial Public Offerings (IPOs)

One of the most visible primary market activities is the IPO — when a private company first sells its stock to the public. Some notable examples:

• Airbnb raised $3.5 billion in its December 2020 IPO
• Meta (Facebook) raised $16 billion in its 2012 IPO — one of the largest in history
• Snowflake raised $3.4 billion in 2020, the largest software IPO ever at the time

In a primary market transaction, the money flows from investors to the issuing company. The company receives the proceeds (minus the investment bank's fees) and can use them for operations, expansion, or debt repayment. This is fundamentally different from secondary market trading, where the company doesn't receive any money from the trade.

Secondary Markets: Where Securities Are Traded

Once securities have been issued in the primary market, they trade hands among investors in the secondary market. The NYSE, Nasdaq, and bond trading platforms are all secondary markets. This is where most everyday investing happens.

Why Secondary Markets Matter

You might think secondary market trading doesn't matter to the original issuer — after all, the company doesn't receive any money when its stock trades on the NYSE. But secondary markets are essential to the primary market's functioning. Here's why:

• Liquidity: Investors are more willing to buy new issues (primary market) if they know they can sell them later (secondary market). Without a liquid secondary market, primary market issuance would dry up.
• Price discovery: Secondary market trading establishes the market price of securities. This tells companies what their stock is worth, which informs future capital-raising decisions.
• Trading volume: The average daily trading volume on the NYSE exceeds billions of shares — far exceeding primary market issuance. The secondary market is where the real action is.

Money Markets: Short-Term Debt Instruments

Money markets deal in short-term debt securities — instruments that mature in one year or less. These markets allow entities with excess short-term cash to lend to those who need short-term funding. The participants are typically large institutions: corporations, banks, governments, and mutual funds.

Key Money Market Instruments

Money market instruments are generally considered low-risk, low-return investments. They're designed for safety and liquidity, not for growth. Corporations park excess cash in money market funds to earn a small return while keeping funds accessible. The total outstanding value of money market instruments has grown significantly over time as businesses increasingly manage short-term cash efficiently.

Capital Markets: Long-Term Debt and Equity

Capital markets handle long-term securities — those with maturities greater than one year, plus equity (which has no maturity at all). Because of their longer time horizons, capital market instruments experience wider price fluctuations and carry more risk than money market instruments.

Capital Market Instruments

Mortgage-Backed Securities: A Cautionary Tale

Mortgage-backed securities bundle many individual mortgages into a single tradable security. Investors receive a share of the principal and interest payments from the underlying mortgages. While innovative, MBS played a central role in the 2008 financial crisis — when the underlying mortgages defaulted en masse, these securities collapsed in value, triggering a systemic banking crisis.

Derivative Securities and Foreign Exchange Markets

Derivatives

A derivative security is a financial instrument whose value is derived from (linked to) an underlying asset or benchmark. Common types include:

• Futures contracts — Obligation to buy or sell an asset at a predetermined price on a future date
• Options — Right (but not obligation) to buy or sell at a set price before expiration
• Swaps — Agreements to exchange cash flows (e.g., interest rate swaps, currency swaps)

Derivatives serve two main purposes: hedging (reducing risk) and speculation (betting on price movements). A farmer might use futures to lock in a price for their crop, eliminating the risk of price drops. A corporation with international operations might use currency forwards to hedge exchange rate risk.

Foreign Exchange Markets

Most large companies operate globally, which means events in other countries' financial markets can directly affect their profitability. ExxonMobil, for instance, sells oil globally in dollars but operates facilities across continents — currency fluctuations can add or subtract millions from earnings overnight.

The foreign exchange (FX) market is the largest financial market in the world, with daily trading volume exceeding $7 trillion. Exchange rate movements affect import/export costs, overseas investment returns, and the competitiveness of U.S. companies abroad.

Financial Institutions: The Intermediaries

Financial institutions perform the essential function of channeling funds from those with surplus capital to those who need it. Without them, every investor would have to find a borrower directly — an incredibly inefficient process. Institutions solve this by aggregating funds, assessing creditworthiness, and diversifying risk.

Major Types of Financial Institutions

Why Institutions Exist: Solving Information Problems

In a world without financial institutions, fund suppliers would have to directly evaluate every potential borrower — researching creditworthiness, monitoring performance, enforcing contracts. Institutions solve several problems:

• Information advantage: Banks have much greater incentive and expertise to collect information and monitor borrowers than individual investors do
• Diversification: Mutual funds and banks spread risk across many loans/investments, reducing the impact of any single default
• Liquidity: Banks transform illiquid loans into liquid deposits — you can withdraw your savings anytime, even though the bank has lent the money out long-term
• Transaction cost reduction: Aggregating funds reduces per-unit transaction costs

Interest Rates and the Loanable Funds Theory

There is no single "the interest rate" — there are tens or hundreds of interest rates appropriate for different situations. The rate on a 30-year mortgage differs from the rate on a 6-month car loan, which differs from the rate on a 10-year corporate bond. But all interest rates share a common foundation: the loanable funds theory.

Supply and Demand for Loanable Funds

Interest rates are determined by the interaction of supply and demand in the market for loanable funds:

• Supply of funds comes from savers (households, businesses with excess cash, foreign investors). Generally, more funds are supplied as interest rates increase — higher returns incentivize more saving.
• Demand for funds comes from borrowers (businesses investing in projects, consumers buying homes, governments financing deficits). Generally, more funds are demanded as interest rates decrease — cheaper borrowing encourages more borrowing.

Equilibrium Interest Rate

The equilibrium interest rate is the rate where the quantity of funds supplied equals the quantity demanded. If rates are above equilibrium, surplus funds push rates down. If below, shortage of funds pushes rates up. The market self-corrects — just like any supply-and-demand market.

But supply and demand curves can shift. Factors that shift the supply curve include changes in savings habits, foreign capital flows, and central bank policy. Factors that shift the demand curve include business investment opportunities, government borrowing needs, and consumer confidence. When these curves move, the equilibrium rate changes.

What Drives Differences in Interest Rates?

Not all interest rates are the same — even for similar securities. Several factors cause rates to differ across the financial landscape. Understanding these factors helps explain why a corporate bond pays more than a Treasury bond, or why a 30-year mortgage rates differs from a 15-year.

The Interest Rate Decomposition

Where each component represents a different risk or factor:

The Fisher Effect

The relationship between the real risk-free rate, inflation, and the nominal rate is called the Fisher effect:

This explains why interest rates tend to rise during inflationary periods — lenders demand higher nominal rates to preserve their real purchasing power. When inflation surged in 2021-2023, the Federal Reserve raised rates aggressively to combat it, and all interest rates across the economy rose in response.

Default Risk: The Credit Spread

The difference between a corporate bond's yield and a Treasury bond's yield of the same maturity is called the credit spread. Higher-rated bonds (Aaa/AAA) have smaller spreads; lower-rated bonds (Baa/BBB and below) have larger spreads. During economic crises, credit spreads widen dramatically as default fears rise — the Baa spread peaked sharply during the 2008 financial crisis.

The Yield Curve: Term Structure of Interest Rates

The yield curve shows the relationship between interest rates (yields) and time to maturity for bonds of the same credit quality (typically Treasury securities). It's one of the most closely watched indicators in finance because its shape reveals market expectations about future economic conditions.

Three Shapes of the Yield Curve

Three Theories Explain the Curve's Shape

• Unbiased Expectations Theory (UET): The yield curve reflects the market's current expectations of future short-term rates. If investors expect rates to rise, the curve slopes upward. Long-term rates are simply the geometric average of expected future short-term rates.
• Liquidity Premium Theory (LPT): Investors demand a premium for holding longer-term securities (which have more price risk). This premium is added on top of the expectations-based rate, making the curve steeper than UET alone would predict.
• Market Segmentation Theory: Different investors have preferred maturity ranges (e.g., pension funds prefer long-term, money market funds prefer short-term). Supply and demand within each maturity "segment" independently determines that segment's rate. The curve shape depends on the relative supply and demand in each segment.

Why the Yield Curve Matters

An inverted yield curve (short-term rates above long-term rates) has historically been one of the most reliable predictors of economic recession. It signals that investors expect rates to fall in the future — which typically happens when the economy slows and the Fed cuts rates. Every U.S. recession since 1970 was preceded by an inverted yield curve.

Forward Rates

Using the unbiased expectations theory, we can extract forward rates — the market's implied expectation of what future interest rates will be. If the 1-year rate is 4% and the 2-year rate is 5%, the implied 1-year rate one year from now is approximately 6%. This lets investors forecast interest rate movements and make informed decisions about bond maturities.

Key Takeaways

• Financial markets channel funds from savers to borrowers along two dimensions: primary vs. secondary and money vs. capital
• Primary markets = new securities issued; issuer receives the cash. Secondary markets = existing securities traded; provides liquidity and price discovery
• Money markets = short-term debt (≤1 year): T-bills, commercial paper, repos. Low risk, high liquidity
• Capital markets = long-term debt + equity: Treasury bonds, corporate bonds, stocks, MBS. Higher risk, wider price swings
• Derivatives (futures, options, swaps) derive value from underlying assets; used for hedging and speculation
• Financial institutions (banks, insurance companies, mutual funds, pension funds) solve information, diversification, and liquidity problems
• Interest rates are determined by supply and demand for loanable funds
• Interest rate = real risk-free rate + inflation premium + default risk premium + liquidity premium + maturity risk premium
• The Fisher effect: nominal rate ≈ real rate + expected inflation
• The yield curve shows rates vs. maturity; its shape is explained by expectations, liquidity premium, and market segmentation theories
• An inverted yield curve has preceded every U.S. recession since 1970 — a powerful forecasting tool