While Chancellor Friedrich Merz’s government is catapulting Germany into a debt spiral, long-struggling Argentina has begun paying down its liabilities. President Javier Milei is holding up a mirror to Berlin’s debt-addicted political class -- and the reflection is one of unmistakable failure. It took Argentina’s President Milei barely six months, right in the middle of the severe economic crisis he inherited from his socialist predecessors, to clean up a completely ruined public budget. That was in June of last year. This week, the Finance Ministry in Buenos Aires reported something that, in Germany today, would probably be dismissed as fiscal...