With three months to go before Germans go to the polls, Chancellor Angela Merkel put her cards on the table on Monday, maintaining her tough stance on austerity for debt-ridden euro zone nations in an election manifesto that could be at the center of EU policy for the next five years.

"Against the background of the different (parties') election manifestos, the election results could have an impact on Germany's euro crisis management," Carsten Brzeski, senior economist at ING said.