Zimbabwe Printed a Hundred Trillion Dollar Note
By 2008 Zimbabwe was issuing banknotes with denominations that had lost all practical meaning. The currency was eventually abandoned entirely in favour of foreign money.
The Collapse
Zimbabwe experienced one of the most severe hyperinflations recorded. By 2008 prices were rising at rates that made ordinary commerce impossible, and the central bank issued notes in denominations including one hundred trillion dollars.
Those notes are now sold as souvenirs, which is a reasonable summary of what happened to the currency.
The Fiscal Origin
As with every hyperinflation, the cause was fiscal rather than technical. The government faced obligations it could not fund through taxation and could not finance through borrowing.
Agricultural output had collapsed following land redistribution, which destroyed both export earnings and the tax base. Government spending continued, including military commitments and payments to constituencies.
With no other financing available, the central bank funded the deficit by creating money.
The printing was the mechanism. The cause was a government that had run out of every other way to pay for what it had committed to spend.
Why It Accelerated
The acceleration came from behaviour rather than from arithmetic alone. Once people expect rapid price increases, holding currency for any length of time imposes a visible loss.
Wages were spent immediately on receipt. Sellers priced ahead of anticipated costs. Anyone able to convert holdings into foreign currency or goods did so.
That increases velocity, meaning the same money changes hands more frequently, which raises prices independently of further issuance. Meanwhile the real value of tax revenue collapsed, because taxes are assessed and collected with a lag, widening the deficit and requiring more printing.
How It Ended
Zimbabwe abandoned its currency. The economy dollarised, with the United States dollar and other foreign currencies used for transactions.
Inflation stopped almost immediately, which demonstrates the point about credibility. The government could no longer print, because it did not issue the currency being used, so the mechanism producing inflation was removed entirely.
The cost was severe. Dollarisation eliminated monetary policy as a tool, constrained the central bank's ability to support banks, and created a persistent shortage of physical currency. Subsequent attempts to reintroduce a domestic currency encountered predictable difficulty, because credibility once destroyed is expensive to rebuild.
What It Demonstrates
Two things. Hyperinflation is a fiscal phenomenon that expresses itself monetarily, and it ends when the fiscal arrangement credibly changes.
And abandoning your own currency works by removing the government's ability to inflate, which is exactly why it works and exactly what it costs. A country that dollarises has purchased price stability by surrendering monetary sovereignty, and that trade is only attractive when sovereignty has already been used destructively.
The Bottom Line
Zimbabwe printed because it had no other way to pay, and the inflation stopped the moment it could no longer print. Adopting a foreign currency is a confession that credibility cannot be restored any other way.