0.9 How Currency Is Created Today — and How Much Is Too Much
Summary: The central bank creates only notes, coins and bank reserves; ordinary banks create most money by lending, because a new loan credits a new deposit. What limits lending is capital, liquidity rules, willing borrowers and the policy rate, not a reserve multiplier.
- When a bank lends a household $300,000, it credits $300,000 to the borrower’s account; no saver’s balance is reduced to fund it.
- The US reserve requirement has been zero since March 26, 2020, and the Fed pays interest on reserves, so it can hold a large stock of reserves and still control short-term rates.
- Currency is about 10.6% of US M2 ($2.48 trillion of $23.34 trillion), so roughly nine of every ten dollars exist as account entries.
- Printing far beyond what an economy produces leads to hyperinflation, as in Germany, Hungary, Zimbabwe and Venezuela.
In the modern fiat system, currency creation is more complex than a government simply “printing money.” Money exists in several distinct forms, which economists categorize by how liquid they are — how easily and immediately they can be used for transactions.
The Money Supply: M0 to M3
| Category | What It Includes | Controlled By |
|---|---|---|
| M0 — Base Money | Physical notes and coins in circulation, plus commercial banks’ reserves held at the central bank | Central bank (supplies reserves; cash amount set by public demand) |
| M1 — Narrow Money | M0 plus demand deposits (current/checking accounts) that can be spent immediately | Central bank + banking system |
| M2 — Broad Money | M1 plus savings accounts, money market accounts, and other near-liquid deposits | Central bank + banking system |
| M3 — Broadest Money | M2 plus large time deposits and institutional money funds | Hardest to control directly |
The central bank creates only the innermost circle: notes and coins, plus the reserves that commercial banks keep in their accounts at the central bank. Almost all the money outside that circle is created by ordinary commercial banks, and the way they do it surprises most people: when a bank makes a loan, it creates a new deposit. Lend a household $300,000 for a house and the bank credits $300,000 to the borrower’s account; no saver’s balance is reduced to fund it. The bank’s assets (the loan) and its liabilities (the deposit) rise together, and new money exists. When the loan is repaid, the deposit is extinguished and that money disappears. The Bank of England set this out in its 2014 paper “Money creation in the modern economy”; Section 3.2: How Banks Create Money — Fractional Reserve Banking works it through with T-accounts.
What stops banks from creating money without limit is not a pool of deposits waiting to be lent. It is four brakes:
- Capital requirements: every loan must be backed by a slice of the bank’s own equity, so lending stops when capital runs short.
- Liquidity rules: the bank must hold enough safe, sellable assets to survive a wave of withdrawals.
- Borrowers: someone creditworthy has to want the loan.
- The policy rate: the central bank sets the price of money, which shapes the rate on every loan.
Reserves come afterward: a bank obtains or borrows them to settle payments, not as a precondition for lending. Older textbooks told the story the other way round, as a “money multiplier” in which a reserve requirement fixed how far deposits could grow; that textbook multiplier is now history, and the US reserve requirement has been zero since March 26, 2020 (Section 3.2: How Banks Create Money — Fractional Reserve Banking explains why the old story fails).
Central banks can also create money directly. In quantitative easing (QE) the central bank buys government bonds, often from investors such as pension funds, and pays by crediting new reserves to the seller’s bank, which credits the seller’s deposit: reserves and deposits rise together in one step. Quantitative tightening (QT) runs the process in reverse. Because the Fed pays interest on the reserves banks hold (Section 2.10: The Federal Funds Rate: How the Fed Actually Sets the Price of Money), it can keep a large stock of reserves without losing control of short-term interest rates.
Central banks do not simply decide how much money to print based on government spending needs — that would be a recipe for inflation. They steer money mainly through its price: they set a policy interest rate, and higher rates make loans more expensive, so fewer are taken and less new money is created. They set that rate with four things in view: their inflation target (typically about 2% a year); GDP growth; employment levels (the US Federal Reserve has an explicit dual mandate of stable prices and maximum employment); and exchange rates and capital flows (especially critical for smaller open economies like India).
The borrower does not keep the new $300,000 deposit for long: it goes to the seller of the house, who banks elsewhere. The borrower’s bank sends the payment, and the two banks settle it by moving $300,000 of reserves across their accounts at the central bank. The seller now holds the deposit, and the total amount of money in the economy is unchanged by the transfer: payments move money between banks; only new lending, repayment and central bank purchases or sales change the total, while a cash withdrawal merely changes its form from deposits to notes. This is why a bank cares about reserves after it lends: it needs them, or the ability to borrow them overnight, to settle what its customers pay away. In the US today, currency is a small part of the money stock: $2.48 trillion ÷ $23.34 trillion (M2) ≈ 10.6%, so roughly nine of every ten dollars in M2 exist as entries in bank and money fund accounts.
When Governments Print Money Recklessly — Hyperinflation
When governments cannot fund spending through taxes or borrowing, they sometimes instruct their central bank to simply create money. If the amount created far exceeds the economy’s productive output, the result is predictable and devastating.
| Country | Period | Peak Inflation Rate | What Happened |
|---|---|---|---|
| Weimar Germany | 1922–1923 | 29,500% per month at peak | Deficits and war reparations financed by printing money. At the October 1923 peak, prices doubled roughly every four days. |
| Hungary | 1945–1946 | 41.9 quadrillion % per month | The worst hyperinflation on record, after World War Two: at the July 1946 peak, prices doubled roughly every 15 hours. |
| Zimbabwe | 2007–2008 | 79.6 billion % per month | Government printed money to fund budget deficits; at the November 2008 peak, prices doubled roughly every day. Zimbabwe abandoned its currency entirely in 2009. |
| Venezuela | 2018 (peak year) | ≈65,000% for 2018 as a whole (IMF) | Oil revenue collapse plus money printing. Annual inflation stayed above 1,000% through 2021. |
Imagine a village bakery that makes 100 loaves a day and the village has 100 coins. Each loaf costs 1 coin. If the village leader suddenly creates 200 extra coins (total: 300) but the bakery still makes only 100 loaves, the price of each loaf rises to 3 coins. The coins didn’t create more bread — they just made each coin worth less. That is inflation from money printing, scaled up to a national economy.
Part 0: How Money Was Born‘s rules of thumb hold most of the time. Here is where they bend.
| Situation | What changes | Why |
|---|---|---|
| “Creating money causes inflation” | QE in a deep slump can multiply bank reserves while prices stay subdued | Reserves sit at the central bank; prices rise only if the new deposits are spent faster than output can grow |
| “The central bank controls cash” | It controls the price of money, not how many notes people hold | Central banks supply whatever cash the public asks for; banks buy notes with their reserves |
| “Fiat money is backed by nothing” | A note is a liability of the central bank, which holds assets against it | The state also accepts it for taxes and makes it legal tender, which anchors demand for it |
| “Higher rates strengthen a currency” | A hike made in panic can weaken it further | If investors read the hike as a sign of crisis or default risk, they sell regardless of the extra yield |
| “A peg delivers stability” | Only while reserves and credibility last | Once markets doubt the reserves, betting against the peg becomes a one-way trade (Section 9.7: The Rest of the World: Capital-Flow Stories from Emerging Markets) |
| “A weaker currency boosts exports” | The boost shrinks for exporters that import their inputs or invoice in dollars | Their costs rise with the currency’s fall, and dollar-priced goods do not get cheaper abroad |
The central bank creates notes, coins and bank reserves; commercial banks create most money by lending, because a new loan credits a new deposit, and repayment destroys it. Lending is limited by capital, liquidity rules, willing borrowers and the policy rate, not by a reserve multiplier, and QE creates reserves and deposits together. When governments print far beyond what the economy produces, hyperinflation follows, as in Germany, Hungary, Zimbabwe and Venezuela.
Four questions on this chapter. Decide on your answer first, then click “Reveal Answer.”
1. A bank approves a $300,000 mortgage. What happens to the money supply at that moment?
- It is unchanged, because the bank lends out $300,000 of other customers’ savings
- It rises by $3,000,000, because a 10% reserve ratio multiplies the loan tenfold
- It rises by $300,000, because the bank credits a new deposit to the borrower
- It falls by $300,000, because the bank’s reserves drop by that amount
Reveal Answer
Answer: C. When a bank lends, its loan asset and the borrower’s deposit rise together, creating new money; the textbook multiplier no longer describes this.
2. Which of these is NOT one of the brakes the chapter lists on bank money creation?
- Capital requirements backed by the bank’s equity
- The quantity of deposits the bank already holds
- Liquidity rules on safe, sellable assets
- The policy rate set by the central bank
Reveal Answer
Answer: B. Banks do not lend out a prior pool of deposits; capital, liquidity rules, borrowers and the policy rate are the limits.
3. In US data for August 2026, currency in circulation was about $2.48 trillion and M2 about $23.34 trillion. Roughly what share of M2 was currency?
- About 48%
- About 25%
- About 2%
- About 11%
Reveal Answer
Answer: D. $2.48 trillion ÷ $23.34 trillion ≈ 10.6%; most money exists as entries in bank and money fund accounts.
4. A central bank buys $1 billion of government bonds from a pension fund under QE. What happens?
- Reserves at the fund’s bank and the fund’s deposit both rise by $1 billion
- The pension fund’s deposit falls by $1 billion and reserves stay unchanged
- Only currency in circulation rises, by $1 billion of new notes
- Bank reserves fall by $1 billion as the bank pays for the bonds
Reveal Answer
Answer: A. The central bank pays with new reserves credited to the seller’s bank, which credits the seller’s deposit: reserves and deposits rise together.
0.10 How a Currency's Value Is Determined — and Who Does It
Summary: No authority sets a floating currency’s value; it emerges from the foreign exchange market, moved by interest rates, inflation differences, trade, growth, politics, speculation and central bank intervention. The impossible trinity says a country can keep only two of a fixed rate, open capital and its own interest rates.
- The FX market traded about $9.6 trillion a day in April 2025, with the US dollar on one side of roughly 89% of trades.
- A 10% fall in the rupee makes gasoline dearer for Indian families, because oil is priced in dollars, but makes Indian software exports more competitive.
- At end-March 2026, India’s banknotes in circulation were worth ₹41,23,995 crore (about ₹41.2 lakh crore), up 11.9% in a year, and ₹500 notes were 85.5% of that value.
- A yen carry trade can unwind fast: a move from 160 to 145 yen per dollar is a yen rise of about 10.3% and wipes out about 92% of a $1,000,000 margin.
In today’s floating exchange rate system, no single authority sets the value of a currency. Its value emerges from the continuous interaction of millions of buyers and sellers in the global foreign exchange (FX or forex) market — the largest financial market in the world, trading an average of about $9.6 trillion per day in April 2025, with the US dollar on one side of roughly 89% of all trades.
The Seven Forces That Drive Currency Value
- Interest rates: Higher rates attract foreign capital seeking better returns. Investors buy that country’s currency, pushing its value up. This is why US Federal Reserve decisions immediately move the dollar.
- Inflation differentials: A country with lower inflation than its trading partners sees its currency appreciate over time, because its goods remain relatively cheaper and in demand.
- Trade balance: Countries exporting more than they import see strong demand for their currency — buyers need local currency to pay for exports.
- Economic growth prospects: A fast-growing economy attracts investment, which requires purchasing local currency, pushing its value up.
- Political stability and institutional quality: Investors flee political uncertainty. Stable, well-governed countries tend to have stronger currencies, all else equal.
- Speculation: Currency traders take positions based on expected future movements, creating self-fulfilling short-term price moves. The best-known position is the carry trade: borrowing in a low-interest currency to invest in a high-interest one, which pays steadily until the funding currency jumps. In early August 2024, days after the Bank of Japan raised its policy rate to around 0.25% on July 31 and a weak US data release, investors rushed to unwind yen-funded positions that the BIS estimates at about ¥40 trillion ($250 billion) beforehand, jolting currency and stock markets worldwide (the worked example below shows the arithmetic).
- Central bank intervention: Central banks sometimes buy or sell their own currency to influence its value — effective short-term, but only sustainable when backed by the right fundamentals.
Exchange Rate Regimes
| Regime | How It Works | Examples | Trade-Off |
|---|---|---|---|
| Fully Floating | Market determines value entirely | USD, EUR, GBP, JPY | Maximum flexibility; can be volatile |
| Managed Float | Market-determined but central bank intervenes occasionally to smooth volatility | India (INR), China historically | Compromise between stability and flexibility |
| Fixed Peg | Currency fixed to another (usually USD) | Saudi Riyal, UAE Dirham | Stability for trade; requires large FX reserves to defend |
| Currency Board | Strict peg backed 1:1 by foreign reserves | Hong Kong Dollar (linked to USD since October 17, 1983) | Maximum credibility; no independent monetary policy |
Behind the choice of regime sits a hard constraint economists call the impossible trinity: a country can have at most two of a fixed exchange rate, free movement of capital and an interest rate set for its own economy. Hong Kong keeps the peg and open capital, so its interest rates follow US rates whether or not that suits Hong Kong. The US keeps open capital and its own rates, so the dollar floats. A country that wants both a steady currency and its own rates has to limit capital flows. Section 1.20: The Accounting of an Economy develops the idea in full.
Strong vs Weak Currency — Real-World Impacts
| Factor | Strong Currency | Weak Currency |
|---|---|---|
| Imports | Cheaper — consumers benefit | More expensive — feeds domestic inflation |
| Exports | More expensive for foreigners — hurts export competitiveness | Cheaper for foreigners — boosts export volumes |
| Tourism | Traveling abroad becomes cheaper | Hosting foreign visitors earns more in local terms |
| Foreign Debt | Easier to repay foreign-currency denominated debt (fewer local units needed to buy the foreign currency) | Harder if debt is in a foreign currency |
| Inflation | Tends to keep inflation lower | Tends to push inflation higher via import costs |
| Example | Strong USD: US consumers buy cheap imports | Weak INR: Indian IT exports become more price-competitive globally |
Currency valuation is not an abstract academic exercise. A 10% depreciation of the Indian rupee makes gasoline more expensive for every Indian family, because oil is priced in dollars. It simultaneously makes Indian software exports more competitive globally, because foreign clients pay in dollars and Indian salaries are in rupees. Every currency move has real winners and real losers within the same economy — at the same time.
1. A rumor spreads that a government will “print unlimited money to make everyone rich.” Trace what actually happens to prices, savings, and trust in the currency — then check your answer against the hyperinflation section. 2. India suddenly returned to a gold standard tomorrow. What would happen to the RBI’s ability to fight a recession? (Hint: recall why the Great Depression pushed countries off the gold standard, Section 0.5: The Gold Standard — Anchoring Paper to Metal.) 3. Explain to a friend, in under a minute, why a ₹500 note — paper worth a few rupees — buys ₹500 of goods. If your answer contains the word “trust,” you’ve understood fiat money.
Illustrative round numbers, not market quotes. A fund borrows ¥1,600,000,000 for three months at 0.25% a year, converts it at 160 yen per dollar, and buys US Treasury bills yielding 5% a year. Its broker requires $1,000,000 of margin.
| Step | Formula | Result |
|---|---|---|
| Dollars raised | ¥1,600,000,000 ÷ 160 | $10,000,000 |
| Yen owed after 3 months | ¥1,600,000,000 × (1 + 0.25% × 0.25) | ¥1,601,000,000 |
| Dollars after 3 months | $10,000,000 × (1 + 5% × 0.25) | $10,125,000 |
| Repay if the rate stays at 160 | ¥1,601,000,000 ÷ 160 | $10,006,250 → profit $118,750 |
| Repay if the yen strengthens to 145 | ¥1,601,000,000 ÷ 145 | $11,041,379 → loss $916,379 |
A move from 160 to 145 is a yen rise of 160 ÷ 145 − 1 ≈ 10.3%, and it wipes out $916,379 ÷ $1,000,000 ≈ 92% of the margin. The carry pays a small, steady income and loses a large amount suddenly. Every fund forced to close does the same thing at once, selling dollar assets and buying yen to repay, which pushes the yen up further and forces the next fund out: the self-reinforcing unwind seen in August 2024.
Indian figures use two units of their own: a lakh is 100,000 (written 1,00,000) and a crore is 10 million (1,00,00,000), or 100 lakh, so ₹1 lakh crore is ₹1 trillion. The rupee is fiat money in the sense of Section 0.7: Fiat Currency — Money Backed by Nothing But Trust: no note can be exchanged for gold, and the Reserve Bank of India (RBI) issues notes to meet whatever cash the economy demands. At end-March 2026, banknotes in circulation were worth ₹41,23,995 crore (about ₹41.2 lakh crore), up 11.9% in a year, and ₹500 notes made up 85.5% of that value. Cash still matters even in the country of UPI: an RBI survey of households and small retail sellers found a continued strong preference for it. The digital rupee (e₹) is tiny by comparison: ₹771.7 crore ÷ ₹41,23,995 crore ≈ 0.02% of banknote value. When the RBI withdrew the ₹2,000 note in May 2023, 98.45% of the ₹3.56 lakh crore outstanding had come back by March 31, 2026. On the exchange rate, India runs the managed float of Section 0.10: How a Currency’s Value Is Determined — and Who Does It: the market sets the rupee-dollar rate, and the RBI trades in onshore and offshore markets to curb excessive volatility rather than to fix a level.
A floating currency’s value is set in the FX market, about $9.6 trillion a day in April 2025 with the dollar on one side of roughly 89% of trades, and moved by rates, inflation, trade, growth, politics, speculation such as the carry trade, and intervention. Regimes run from free floats to pegs and currency boards, and the impossible trinity says a country can keep only two of a fixed rate, open capital and its own interest rates.
Four questions on this chapter. Decide on your answer first, then click “Reveal Answer.”
1. According to the BIS 2025 survey, roughly how much foreign exchange changed hands per day in April 2025?
- About $7.5 trillion
- About $12.4 trillion
- About $9.6 trillion
- About $5.1 trillion
Reveal Answer
Answer: C. The BIS Triennial Survey put average daily turnover at about $9.6 trillion in April 2025, up from the 2022 survey’s level.
2. A fund borrows ¥1,601,000,000 to repay in three months. If the yen strengthens from 160 to 145 per dollar, how many dollars does it need to repay?
- About $9,059,000
- About $11,041,000
- About $10,125,000
- About $10,006,000
Reveal Answer
Answer: B. ¥1,601,000,000 ÷ 145 ≈ $11,041,379, about $1,035,000 more than at 160.
3. Hong Kong keeps its currency linked to the US dollar and allows capital to move freely. Under the impossible trinity, what does it give up?
- Interest rates set for its own economy
- The ability to trade with other countries
- Its foreign exchange reserves
- Free movement of capital
Reveal Answer
Answer: A. A country can have only two of a fixed rate, open capital and independent rates; Hong Kong’s rates follow US rates.
4. A 10% fall in the rupee has which pair of effects in India, according to the chapter?
- Neither prices nor exports change, because oil is priced in rupees
- Gasoline costs less, while software exports become less competitive
- Both gasoline and software exports become cheaper for foreigners
- Gasoline costs more, while software exports become more competitive
Reveal Answer
Answer: D. Oil is priced in dollars, so imports cost more; dollar-paid exports with rupee costs gain.
- Federal Reserve, H.6 announcement of February 23, 2021 — Savings deposits counted in M1 from May 2020 (Section 0.9)
- Federal Reserve, Reserve Requirements — US reserve requirement ratios zero since March 26, 2020 (Sections 0.9, 2.3, 3.2)
- Federal Reserve, H.6 Money Stock Measures — August 2026 M1, M2, currency and reserve balances; only M1 and M2 published (Section 0.9)
- IMF World Economic Outlook data, Venezuela consumer prices — Annual average inflation 2018-2021 (Section 0.9)
- Bank of England, Money creation in the modern economy (Quarterly Bulletin 2014 Q1) — Loans create deposits; repayment destroys money; QE; the money multiplier misconception (Sections 0.9, 3.2)
- BIS Bulletin 90, The market turbulence and carry trade unwind of August 2024 — Yen carry trade estimate of about ¥40 trillion ($250 billion) (Section 0.10)
- BIS Triennial Central Bank Survey 2025 (OTC FX turnover) — $9.6 trillion daily FX turnover and US dollar share, April 2025 (Section 0.10)
- RBI Annual Report 2025-26, Currency Management