10 Chapter 10 of 10 · 14 min read · Updated September 22, 2026
Money, Growth, and the Economy
Where money comes from, what the Federal Reserve does, why prices rise, why the national debt matters, and why the only lasting way for a country to get richer is to produce more per hour of work.
Core facts
- Most money is not printed. About 9 in 10 U.S. dollars exist only as bank deposits, and banks create new deposits when they make loans. Paper currency is about $2.4 trillion of a roughly $22 trillion money supply.
- The Federal Reserve sets the short-term interest rate and can create new bank reserves by buying bonds. Its balance sheet grew from about $0.9 trillion in 2007 to about $9 trillion in 2022.
- Over long periods, prices rise when the amount of money spent grows faster than the amount of goods and services produced. Roughly: inflation ≈ growth in spending − growth in real output.
- Money only raises prices when it gets spent. The Fed created trillions after 2008 and inflation stayed under 2%. Money sent straight to households in 2020 and 2021 was spent, and inflation reached 9.1% in June 2022.
- Gross domestic product (GDP) is the value of everything a country produces in a year: about $30 trillion for the U.S. in 2025. Real GDP removes inflation and is the number that measures whether a country is actually producing more.
- Real GDP grows in only two ways: more hours worked, or more output per hour. U.S. workforce growth is slowing to about 0.5% a year, so output per hour, productivity, is now the main lever.
- U.S. federal debt held by the public is about 100% of GDP, and interest on it costs about $1 trillion a year. A country shrinks its debt relative to its economy by growing faster, by inflation, by taxes and spending cuts, or by default. Only growth leaves people better off.
- The Sheeplz view: AI and robotics are the largest available source of new productivity. How large is disputed. Serious estimates range from under 0.1 to about 1.5 percentage points of extra growth a year.
- A technology can transform the economy and still lose its investors money. What you pay for a stock decides your return (Chapter 2).
Where money comes from
The money supply is the total amount of money people and businesses can spend right away. Its standard measure is M2: cash in circulation, checking and savings deposits, small certificates of deposit, and retail money market funds.
| Layer | What it is | Who creates it | Size, 2025 |
|---|---|---|---|
| Currency | Paper notes and coins | The Fed and the Treasury, on demand from banks | about $2.4 trillion |
| Bank reserves | Banks' accounts at the Fed. Banks use them to pay each other; the public never holds them. | The Fed | about $3 trillion |
| Bank deposits | The balance in your checking and savings accounts | Commercial banks, by lending | most of M2 |
| M2, total | Currency held by the public plus deposits and retail money funds | Mostly banks | about $22 trillion |
How a loan creates money
- You borrow $300,000 for a house.
- The bank does not hand over anyone else's savings. It types $300,000 into the seller's account. That deposit did not exist before; it is new money.
- As you repay the loan, the money disappears again.
So the money supply grows when borrowing grows and shrinks when debt is paid down. Banks have not been required to hold any reserves against deposits since March 2020. What limits their lending is capital rules, their own caution, and how many people want to borrow at the current interest rate. That last part is where the Fed comes in.
What the Federal Reserve does
The Federal Reserve is the U.S. central bank. Congress gave it a dual mandate: maximum employment and stable prices. It defines stable prices as 2% inflation a year, measured by the PCE price index, a broader cousin of the CPI (Chapter 1).
| Tool | What the Fed does | What it is meant to cause |
|---|---|---|
| Fed funds rate | Sets the rate banks charge each other overnight, eight times a year | Every other rate follows: mortgages, car loans, savings accounts, bond yields. Higher rates slow borrowing, spending, and prices. |
| Quantitative easing (QE) | Buys Treasury and mortgage bonds with newly created reserves | Pushes long-term rates down when short rates are already near zero |
| Quantitative tightening (QT) | Lets those bonds mature without replacing them; the reserves disappear | The reverse of QE |
| Lender of last resort | Lends to banks when nobody else will | Stops bank runs from spreading: 2008, March 2020, March 2023 |
| Year | Fed balance sheet | Why |
|---|---|---|
| 2007 | about $0.9 trillion | Before the financial crisis |
| 2014 | about $4.5 trillion | Three rounds of QE after 2008 |
| 2019 | about $4 trillion | Partly shrunk by QT |
| 2022 | about $9 trillion | Pandemic QE |
| Late 2025 | about $6.6 trillion | QT, ended December 2025 |
The Fed and the Treasury are different. The Treasury is the government's bank account: it collects taxes, spends, and borrows by selling bonds. The Fed is independent of it and sets monetary policy. When people say "the government prints money," they usually mean the Treasury borrows and the Fed buys some of those bonds.
Why prices rise
The equation of exchange is an accounting identity: money × how often it is spent = prices × real output, written MV = PY. How often each dollar is spent in a year is the velocity of money.
Read it as: total spending equals total sales. If spending grows faster than the economy's ability to produce, the gap shows up as higher prices. With velocity steady, the arithmetic is simple:
| Money grows | Real output grows | Inflation, roughly |
|---|---|---|
| 6% a year | 2% a year | 4% |
| 6% a year | 4% a year | 2% |
| 6% a year | 6% a year | 0% |
| 25% in one year | Falls, then recovers | High, until output catches up or money stops growing |
This is the core of the chapter. There are two ways to keep prices stable: create less money, or produce more. The first is the Fed's job. The second is everyone else's.
Two experiments
| 2008 to 2019 | 2020 to 2022 | |
|---|---|---|
| New money | About $3.5 trillion of reserves from QE | About $5 trillion of reserves, plus M2 up about 40% in two years |
| Where it went | Mostly sat as bank reserves and pushed up asset prices | Straight to households and businesses: stimulus checks, loans, unemployment benefits |
| Output | Slow, steady growth | Shut down, then short of goods and workers |
| Consumer inflation | Under 2% on average | Peaked at 9.1% in June 2022 |
The lesson: money creation raises consumer prices when it reaches spending faster than output can grow. When it stays inside the financial system, it tends to raise the price of assets instead: stocks, bonds, houses.
Deflation
Deflation is a general fall in prices. There are two kinds, and they are opposites. Deflation from collapsing demand, as in 1930 to 1933, means lost jobs and bankruptcies. Deflation from rising productivity, as with televisions and computing power, means the same money buys more. The second kind is what cheaper production looks like.
GDP: the size of the economy
Gross domestic product (GDP) is the market value of all goods and services produced in a country in a year. Nominal GDP is measured in today's prices. Real GDP removes inflation, so it rises only when the country actually produces more.
| Part of U.S. GDP | Share, roughly |
|---|---|
| Consumer spending | 68% |
| Business investment and housing | 18% |
| Government spending | 17% |
| Exports minus imports | −3% |
Nominal GDP can grow 5% while real GDP grows 2%: the other 3% is inflation. Only the real number measures more houses, food, medicine, and services to share. Living standards follow real GDP per person.
The national debt
The federal government spends more than it collects in taxes almost every year and borrows the difference by selling Treasuries (Chapter 4). The debt-to-GDP ratio compares the debt with the economy that must carry it. It matters more than the dollar total.
| Year | Federal debt held by the public, % of GDP |
|---|---|
| 1946 | about 106% (after World War II) |
| 1974 | about 23% |
| 2007 | about 35% |
| 2020 | about 98% |
| 2025 | about 100%; projected near 120% by 2035 |
Interest on that debt passed defense spending in 2024 and runs about $1 trillion a year. There are four ways to bring the ratio down:
| Exit | How it works | Who pays |
|---|---|---|
| Growth | The economy (the bottom of the ratio) grows faster than the debt | Nobody |
| Inflation | Nominal GDP rises while old debt stays fixed | Savers and bondholders, through lost buying power |
| Austerity | Higher taxes, lower spending | Taxpayers and people who depend on spending |
| Default | Not paying in full | Lenders, and everyone through the financial damage |
From 1946 to 1974 the U.S. cut its ratio from 106% to 23% with a mix of fast real growth and periods of inflation, without ever paying the debt down in dollars. Growth is the only exit on the list that costs nobody.
Productivity: the only free exit
Productivity is output per hour worked. Real GDP growth is, almost exactly, growth in hours worked plus growth in productivity.
| Period | U.S. productivity growth, per year | What drove it |
|---|---|---|
| 1948 to 1973 | about 2.8% | Electricity, cars, highways, and mass production reaching their full use |
| 1973 to 1995 | about 1.5% | Oil shocks; computers everywhere except the statistics |
| 1995 to 2004 | about 3% | Computers and the internet finally reorganizing work |
| 2005 to 2019 | about 1.5% | Slowdown; economists still disagree why |
Hours worked are running out as a source of growth. The U.S. workforce is projected to grow about 0.5% a year over the next decade, down from about 2% in the 1970s and 1980s. There are about 2.7 workers per Social Security recipient today, falling toward 2.3 by 2035. Fewer workers per retiree means each worker must produce more for living standards to hold.
Compounding (Chapter 1) makes the difference large. At 1.5% productivity growth, output per hour doubles in about 48 years. At 3%, it doubles in 24.
The AI and robotics bet
This section states an opinion, marked as one. The U.S. cannot count on more workers, and inflating or taxing its way out of the debt makes people poorer. The one exit that makes everyone richer is producing more per hour. AI, which does thinking work, and robotics, which does physical work, are the largest source of that available. We think they are the central economic story of the next twenty years.
A general-purpose technology is one that changes how nearly every industry works: steam, electricity, computers. They share a pattern. Heavy investment comes first, productivity gains come years later, and most of the benefit goes to users, not to the companies that sold the technology.
| Evidence | What it shows |
|---|---|
| Task studies, 2023 | Customer-support agents with an AI assistant resolved about 14% more issues an hour. Programmers with an AI coding tool finished a set task about 56% faster. |
| Investment | The largest U.S. technology companies spent more than $350 billion on capital expenditure in 2025, mostly on data centers. |
| Robots at work | About 4.3 million industrial robots operate worldwide. Per 10,000 factory workers: South Korea about 1,000, China about 470, the U.S. about 295. |
| Optimistic estimate | Goldman Sachs (2023): about 1.5 percentage points of extra U.S. productivity growth a year over a decade. |
| Cautious estimate | Daron Acemoglu (2024): under 0.1 percentage points a year over the same decade. |
What would decide which estimate is right:
- Adoption speed. Factories took about 40 years to redesign themselves around the electric motor. Gains arrive when work is reorganized, not when the tool is invented.
- Limits. Chips, electricity, and data centers take years to build. Power supply is already a bottleneck.
- Payback. The spending must eventually earn profits from customers. If it does not, investment falls and the build-out stalls.
- Displacement. Output per hour can rise while some jobs disappear. How the gains are shared is a political question, not a technical one.
The counter-view deserves stating. Other levers exist: more immigration, higher workforce participation, cheaper housing and energy. Most economists expect AI's effect to be real and slower than the headlines.
What it means for an investor
None of this says what to buy. It explains the forces behind the prices in every earlier chapter.
| Force | Effect | Chapter |
|---|---|---|
| Money growth above output growth | Cash and fixed-rate bonds lose buying power. Owners of businesses that can raise prices are partly protected. | 1, 4 |
| The Fed raises rates | Future profits are worth less today; stock and bond prices usually fall. | 1, 2, 4 |
| QE and falling rates | Asset prices usually rise before consumer prices do. | 2, 5 |
| Productivity growth | More real profits across the economy; the long-run source of stock returns. | 2, 3 |
Who earns first in a build-out
In a build-out, the first revenue goes to the companies selling the equipment: chips, networking, power, construction. Nvidia's data-center revenue rose from about $15 billion in its 2023 fiscal year to about $115 billion in fiscal 2025.
Build-outs also overshoot. Britain's railway boom of the 1840s and America's fiber-optic boom of the 1990s both built networks the economy used for decades, and both left many investors with large losses. Cisco, which sold the equipment of the internet, was the world's most valuable company in March 2000. Its stock fell about 86% by 2002 and was still below that peak twenty years later, while its sales kept growing. The technology was right, and the price was too high.
Being right about the economy is not the same as being paid for it. If everyone already expects a technology to win, the expectation is in the price (Chapter 2). A broad index fund already makes a large AI bet: the biggest technology companies were roughly a third of the S&P 500's value in 2025. Picking individual stocks concentrates that bet further, with more upside and more specific risk.
Common mistakes
- Believing the Fed prints most money. Most dollars are created by banks when they lend.
- Expecting every round of money creation to raise consumer prices at once. It depends on whether the money is spent, and on how fast output grows.
- Treating nominal GDP growth as getting richer. Subtract inflation first.
- Comparing the national debt to a household's credit card. The ratio to GDP and the interest cost matter; the dollar total alone says little.
- Assuming a technology that changes the economy makes every stock connected to it a good investment. Price decides return.
- Trading on an economic forecast. The economy and the stock market can move in opposite directions for years.
Remember
- Banks create most money by lending. The Fed steers it with interest rates and its balance sheet.
- Prices rise when spending grows faster than real output. Two cures: less money, or more output.
- Real GDP grows from more hours or more output per hour. Hours are running out.
- High debt ends through growth, inflation, austerity, or default. Only growth costs nobody.
- AI and robotics are the largest candidate for new productivity. The size and timing are unknown.
- Right about the economy is not the same as paid for it. Price decides return.
Common questions
Does the Fed print money?
Partly. It creates bank reserves when it buys bonds, and it supplies paper currency when banks ask for it. But most of the money people spend is bank deposits, which commercial banks create when they make loans.
Why did QE after 2008 not cause high inflation?
Most of the new reserves stayed inside the banking system instead of reaching household spending, and the economy had unused workers and factories. Asset prices rose instead. In 2020 and 2021 new money went directly to households while output was constrained, and consumer inflation followed.
Can AI cause deflation?
It can push prices down for whatever it makes cheaper to produce, as computing did for electronics. Whether overall prices fall depends on the Fed, which targets 2% inflation and would likely respond. Falling prices from cheaper production are the harmless kind of deflation.
Will the U.S. default on its debt?
A missed payment is unlikely, because the debt is owed in dollars, which the U.S. issues. The realistic risks of high debt are different: higher inflation, higher taxes, lower spending, or higher interest rates for everyone.
Does high national debt mean stocks will fall?
There is no reliable link. U.S. debt was very high after 1946 and stocks did well over the following two decades. Stock returns depend mainly on profits and on the price paid for them.
What is the difference between the Fed and the Treasury?
The Treasury is the government's finance department: it taxes, spends, and borrows. The Federal Reserve is the independent central bank: it sets interest rates, supervises banks, and manages the money supply.