It's not just Argentine fans who woke up depressed following their nation's 1-0 defeat to Germany in the World Cup final. Traders in Buenos Aires are also seemingly feeling blue.

Argentina's main Merval index is down 0.3 percent in lunchtime trading Monday after the team succumbed to a late goal Sunday from German striker Mario Goetze in Rio de Janeiro.

That may not sound too bad, but when compared with other indexes in the region — and the world — Argentine shares are clearly underperforming. In contrast, Germany's DAX closed 1.2 percent higher — the biggest gain Monday among the major European indexes.

Some studies, particularly during the World Cup, have shown that losing a final can depress the mood of traders and cause a country's stock market to underperform.