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When Currency Fails

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A timeline of money, trust & loss

Currency Collapses &
Broken Monetary Promises

Eight histories of destroyed purchasing power—and one moment when the dollar’s gold promise ended. The name on a note can survive. What it promises, and what it buys, may not.

Follow the history 1107 — 2009
Sources within each entry
  1. 1107 SONG DYNASTY
    China · Sichuan Retired without redemption

    Jiaozi: a promise withdrawn

    One of the earliest state-issued paper currencies began with limits on issuance and periodic redemption. As military demands grew, those constraints gave way. More notes circulated, and their value deteriorated.

    What followed. The devalued jiaozi were retired in 1107 without redemption and replaced by qianyin, a new paper issue.

    Evidence & sources

    Christian Lamouroux and Richard von Glahn document the withdrawal in The Cambridge Economic History of China. This entry concerns the failure of a particular note system—not every Chinese paper currency. Early jiaozi had redemption arrangements; their entire history should not be described as unbacked fiat.

  2. Early 1400s MING DYNASTY
    China Severe depreciation & disuse

    Ming paper money loses its place

    The Ming government’s paper currency suffered severe depreciation. Issuing notes while failing to collect enough taxes in that same paper weakened demand for it. Commerce increasingly relied on silver instead.

    What followed. By the early fifteenth century, the paper-money system was largely defunct. The loss of usefulness came before any single, neat retirement date.

    A surviving Ming one-guan paper banknote with Chinese characters and a printed string of coins.
    Ming one-guan banknote · 1375 issueBritish Museum, 1942,0805.1. Photograph by BabelStone, CC0. A surviving note from the system—not an image of jiaozi.
    Image source & reuse information ↗
    Evidence & sources

    Economic historian Richard von Glahn describes Ming paper money as largely defunct by the early fifteenth century, with silver becoming increasingly important in commerce and taxation. We use an approximate period because depreciation and abandonment unfolded over time.

  3. 1779– 1781 AMERICAN REVOLUTION
    United States Collapse & abandonment

    “Not worth a Continental”

    Congress issued Continental dollars to help finance the Revolutionary War. Heavy issuance, a weak tax base and wartime uncertainty eroded confidence. By 1779, the notes traded for only pennies on the dollar.

    What followed. Continentals had stopped circulating by mid-1781. A currency created to fund independence had lost its practical role as money.

    Evidence & sources

    The Federal Reserve Bank of New York places the collapse in 1779 and the end of circulation in mid-1781. Later settlement arrangements complicate claims that every holder received literally nothing; the central point is the destruction of purchasing power and the currency’s abandonment.

  4. 1795– 1796 FRENCH REVOLUTION
    France Hyperinflation & replacement

    The assignat’s revolutionary collapse

    Assignats began as claims backed by confiscated property. War, fiscal pressure and expanding issuance transformed the experiment. Their backing weakened, and inflation accelerated dramatically in 1795–1796.

    What followed. The assignat era ended in 1796, after a collapse in purchasing power. An asset-linked beginning had not guaranteed a stable currency.

    Evidence & sources

    Banque de France research traces the fiscal roots of France’s hyperinflation and the deterioration of the assignats’ original backing. Citéco dates their issuance to 1789–1796. This is a history of a monetary system changing and failing, not an assertion that the notes began as purely unbacked money.

  5. 1923 WEIMAR REPUBLIC
    Germany Hyperinflation & currency reform

    The mark survives in name, not value

    War borrowing and postwar fiscal strain helped set the stage for hyperinflation. By 1923, the paper mark could no longer reliably function as a means of payment or a store of value. Monetary claims denominated in marks were devastated.

    What followed. The Rentenmark was introduced in November 1923. Stabilization did not give savers back the purchasing power they had lost.

    Front and reverse of a worn one-billion-mark Reichsbank note dated September 5, 1923.
    One billion marks · September 1923Front and reverse of a surviving Reichsbank note. Reproduction by ThoBel-0043; public domain via Wikimedia Commons.
    Image source & reuse information ↗
    Evidence & sources

    The Deutsche Bundesbank describes the mark’s loss of its basic monetary functions and the November 1923 reform. This entry is the paper-mark collapse—not the much later, orderly conversion of Deutsche marks into euros.

  6. 1946 POSTWAR HUNGARY
    Hungary Hyperinflation & replacement

    When prices doubled in hours

    War destruction and monetary financing of government spending fed an extraordinary inflation. By July 1946, the pengő was losing value so quickly that ordinary saving and price-setting had become almost impossible.

    What followed. The forint replaced the pengő on August 1, 1946, as part of a wider stabilization program.

    Evidence & sources

    The Magyar Nemzeti Bank documents wartime monetary financing and the introduction of the forint. Hanke and Kwok’s historical comparison gives an approximately 15-hour price-doubling time. That is a rate-equivalent estimate—not a claim that every shop repriced on that schedule.

  7. 1971 AUGUST 15
    United States · International monetary system Gold-convertibility break

    Same name. Fundamentally different currency.

    President Richard Nixon suspended dollar-to-gold conversion for foreign official holders. The dollar kept its name, but its monetary basis fundamentally changed—from a currency with an international gold-redemption promise to a fiat currency without that promise.

    What followed. This was a break in the monetary promise, not a collapse to zero purchasing power. The fixed-exchange-rate system unraveled over 1971–1973.

    Evidence & sources

    The Federal Reserve’s history identifies August 15, 1971 as the closing of the gold window and describes the international monetary system as becoming fiat. The State Department traces the subsequent breakdown of Bretton Woods. Here, “fundamentally different” refers to the dollar’s monetary basis and redemption terms—not the creation of a new legal currency unit or a loss of all purchasing power. This is why the event is counted separately from the collapse histories.

  8. 1993– 1994 YUGOSLAV CRISIS
    Federal Republic of Yugoslavia Hyperinflation & currency reform

    A familiar name, a collapsing dinar

    War, sanctions, collapsing production and monetary financing of fiscal deficits combined in a devastating inflation. The dinar lost its usefulness, while the German mark took over important everyday monetary functions.

    What followed. A stabilization program halted hyperinflation in 1994. Successive changes to the dinar did not preserve the purchasing power of earlier holdings.

    Evidence & sources

    The National Bank of Serbia connects the crisis to economic disruption and fiscal dominance. Hanke and Kwok report the approximately 1.4-day doubling-time estimate. This timeline counts the collapse episode once, rather than counting every redenomination as a separate failure.

  9. 2008– 2009 DEMONETIZED 2015
    Zimbabwe Hyperinflation & abandonment

    One hundred trillion. Forty cents.

    Hyperinflation destroyed the Zimbabwe dollar’s usefulness. A multicurrency system took its place in 2009. The old notes remained as reminders of the crisis until formal demonetization in 2015.

    What followed. In the 2015 cash exchange, a 100-trillion-dollar note from the 2008 series converted to US$0.40. That exchange did not compensate holders for their earlier losses.

    The face of a Zimbabwe 100-trillion-dollar note, marked 2008, showing balancing rocks.
    100 trillion dollars · 2008 seriesIssued in 2009. Reserve Bank of Zimbabwe; scan by Camp0s. Public domain, demonetized currency, via Wikimedia Commons.
    Image source & reuse information ↗
    Evidence & sources

    The Reserve Bank of Zimbabwe’s demonetization statement set a cash rate of Z$250 trillion to US$1 for the 2008 series. Dividing 100 trillion by 250 trillion gives US$0.40. Bank-account balances had different settlement rules. The exchange window ran from June 15 to September 30, 2015.

The historical record

Different currencies. Real losses.

08 Selected collapse histories

Severe loss of purchasing power, abandonment or failed redemption.

01 Gold-convertibility break

1971: the same name, but a fundamentally different monetary basis.

1,000+ Years of paper-money history

State-issued Chinese paper money dates to the early 1020s—not the modern era. Source ↗

These are selected major examples, not an exhaustive catalog or a verified count of all failed fiat currencies. Some began with redemption or asset-backing arrangements. We count collapse episodes—not every renamed note, removed zero or routine currency conversion.

Replacement is not always failure.

An orderly conversion, such as the Deutsche mark’s transition to the euro, is not counted here. What matters is the loss suffered by holders—not simply whether an old currency name disappeared.

Monetary value is not collector value.

Retired notes can still sell as historical objects. That does not restore their old purchasing power or make them circulating money. “Lost virtually all purchasing power” is usually more precise than a universal claim of literal zero.

A closing comparison · About 1,400 years

Gold: Purchasing Power
Across the Centuries

A small gold coin bought sheep in an early historical account. A comparable quantity of gold still buys a small number of sheep in this modern example.

Then Seventh-century Arabia

1 gold dinar

2 sheep purchased

An account preserved in Sahih al-Bukhari describes Urwa receiving one dinar, buying two sheep, then selling one sheep for one dinar. The account records both a purchase and a resale—not a single fixed market price.

Read the historical account (opens in a new tab)

Now August–September 2026 snapshot

4.25–4.55g of gold

≈1.6–1.8 market lambs

Valued as fine gold, that quantity was worth about $598–$640 . An illustrative 125-pound U.S. market lamb cost about $363 at the USDA’s reported average live price.

Gold quote: September 2, 2026.
Lamb report: week ending August 28, 2026. These are dated examples, not live prices.

Gold quotation ↗ USDA report ↗

Similar broad buying power across centuries. This example illustrates enduring purchasing power—not an exact price match or proof that gold’s purchasing power stayed constant.

The ancient coin’s exact weight and purity, and the sheep’s size, are not identified. Different countries, breeds, ages and market conditions limit the comparison. The modern 125-pound lamb is an illustrative size, not a reported average animal.

Calculation, historical context & sources

The British Museum coin description records a Byzantine weight standard of about 4.55g and the later Islamic dinar standard of 4.25g, introduced in the late seventh century. These provide a comparison range; they do not identify or establish the purity of the coin in the earlier account.

U.S. dollars. Metal value assumes fine gold and excludes premiums, transaction costs and any collector value. Calculations use unrounded inputs.
Input or calculation Value
Gold spot bid · September 2, 2026 $4,374.90 per troy ounce
Gold-weight benchmark · valued as fine gold 4.25–4.55 grams
Gold value · grams × price ÷ 31.1034768 $597.79–$639.99
USDA weighted-average live lamb price · August 28, 2026 $290.02 per 100 pounds
Illustrative lamb · 125lb × price ÷ 100 $362.53
Gold value ÷ illustrative lamb cost 1.65–1.77 lamb equivalents

The USDA report covers Choice and Prime slaughter lambs with reported live weights of 73–160 pounds. Applying its average price to a 125-pound animal is our calculation, not a quotation for an individually matched sheep. Historical coin weight is not necessarily fine-gold content.

This is an illustrative comparison between a reported historical transaction and a modern price snapshot—not a continuous purchasing-power index. Gold’s buying power fluctuates and can fall over shorter periods.

The market-source links may show newer quotations or reports; the dates and figures used in this example are preserved above.

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