Workers assemble Aventador automobiles on the production line at the Lamborghini factory near Bologna, Italy.

The news that euro zone business activity expanded for the first time in 18 months in July has reinvigorated the question that analysts love to debate: is the European economy finally on the up?

Euro zone PMI (Purchasing Managers' Index) data out on Monday suggested the area's economy is slowly stabilizing. Markit's euro zone composite PMI rose to 50.5 in July, from 48.7 in June. This was the first time since January 2012 that the PMI had risen above the 50-mark, and was aided by better numbers from peripheral nations such as Spain and Italy.