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The government had to fight tooth and nail withItaly's biggest CGIL trade union over the bill.
But while Monti insisted it was crucial to boosting stagnant growth, some commentators have played down its significance.
"Rather than being revolutionary, this reform seems above all to be a public image operation aimed at foreign investors," Maurizio Del Conte, a labour rights expert atMilan's Bocconi university told AFP.
"The pension reform, which passed almost unnoticed, was much more incisive," he said.
"The labour one, on the other hand, does not address the issue of imbalances between workers' rights and the need of companies