Both have been living high on the hog for years, blithely dishing out the proceeds of an unrepeatable commodities boom (oil in Venezuela; soya in Argentina). Both have been using a mix of central-bank interventions and administrative controls to keep overvalued exchange rates from falling and inflation from rising. Both now face a come-uppance.

High inflation is a shared problem. Argentina’s rate, propelled higher by loose monetary and fiscal policies, is unofficially put at 28%. Argentina’s official exchange rate is overvalued as a result, fetching 70% more dollars per peso than the informal "blue" rate in mid-January. Venezuela’s prices are rising faster still. Last year, during an awkward political transition after the death of Hugo Chávez to the presidency of Nicolás Maduro (pictured with Cristina Fernández de Kirchner, the Argentine president), the Central Bank stepped up money-printing to finance public spending, pushing inflation to 56.2%. A dollar fetches 75-80 bolívares on the black market, up to seven times the official rate.