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In page Hyperinflation:

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Poland has gone through two episodes of hyperinflation since the country regained independence following the end of World War I, the first in 1923, the second in 1989–1990. Both events resulted in the introduction of new currencies. In 1924, the złoty replaced the original currency of post-war Poland, the mark. This currency was subsequently replaced by another of the same name in 1950. As a result of the second hyperinflation crisis, the current new złoty was introduced in 1995 (ISO code: PLN).[citation needed]