Fiscal deficits, elevated debt-to-GDP ratios, and high inflation rates suggest hyperinflation could have potentially emerged in many European countries after World War I. We demonstrate that economic policy uncertainty was a key driver pushing a subset of European countries into hyperinflation shortly after the end of the war. Germany, Austria, Poland and Hungary (GAPH) suffered from frequent uncertainty shocks- and correspondingly high levels of uncertainty-caused by protracted political negotiations over reparations payments, the apportionment of the Austro-Hungarian debt and border disputes. in contrast, other European countries exhibited lower levels of measured uncertainty between 1919 and 1925, allowing them more capacity with which to implement credible commitments to their fiscal and monetary policies. Impulse response functions show that increased uncertainty caused a rise in inflation contemporaneously and for a few months afterwards in GAPH, but this effect was absent or much more limited for other European countries.
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