Hyperinflation

Hyperinflation describes a breakdown in a currency's function as a store of value and medium of exchange, marked by surging prices, collapsing real money balances, and rapid currency substitution into foreign exchange or hard assets. The widely cited quantitative benchmark comes from economist Phillip Cagan's 1956 study The Monetary Dynamics of Hyperinflation, which set the threshold at 50% inflation per month — roughly 12,875% annualized. Accounting standard IAS 29 uses a softer trigger of cumulative inflation approaching or exceeding 100% over three years to require inflation-adjusted financial reporting.

Hyperinflations are almost always fiscal phenomena: governments unable to borrow or tax sufficiently finance deficits by having the central bank create money, which destroys confidence in the currency. As households anticipate further depreciation, money velocity rises, accelerating the price spiral. Episodes typically end only with a credible fiscal-monetary regime change — currency reform, central bank independence, an exchange-rate anchor, or external assistance.

Historically documented hyperinflations include:

• Weimar Germany (1922–1923), where prices roughly doubled every few days at the peak in late 1923 before the Rentenmark stabilization.
• Hungary (1945–1946), the worst on record, with prices doubling approximately every 15 hours; the pengő was replaced by the forint in August 1946.
• Yugoslavia (1992–1994) during the breakup wars.
• Zimbabwe (2007–2009), which led to abandonment of the Zimbabwe dollar and adoption of a multi-currency regime.
• Venezuela, which the IMF and National Assembly recorded as entering hyperinflation in 2017, persisting for several years.

For IR and Model UN work, hyperinflation matters because it intersects with sanctions regimes, sovereign debt restructuring (often involving the IMF and Paris Club), humanitarian crises, refugee flows, and the political legitimacy of regimes. It is frequently cited in debates over central bank independence, dollarization, and conditionality in multilateral lending.