According to a German IWH institute study, the Greek debt crisis has saved the German government some €100 billion ($109 billion) in lower borrowing costs because investors have sought safety in German bonds.
The IWH study says that even if Greece defaults on all its debt, Germany would still benefit.
Greece is hoping to reach a third bailout agreement, worth up to €86 billion, with its creditors this week.
Germany has funded €90 billion so far and wants tough conditions for a new deal.
The terms of the third bailout need to be reached by August 20, when Greece’s next debt repayment to the European Central Bank becomes due.
Greek officials said negotiations were in the “final stretch”, prompting shares in Athens to jump more than 2%. But leading figures in Berlin were cautious that a final deal was close.
German Chancellor Angela Merkel’s spokesman Steffen Seibert said “thoroughness comes before speed”.
German officials are keen for Greece to sign up to credible pension reforms and privatization plans, while the Athens government is looking for urgent funding to recapitalize the country’s ailing banks.
Any deal will have to be ratified by German parliament, many of whom object to handing more funding to the left-wing Syriza government of Alexis Tsipras.
However, the study by Halle Institute for Economic Research said Germany had made interest savings of more than 3% of GDP between 2010 and 2015, and much of that was down to the Greek debt crisis.
Greece sought its first EU-IMF bailout in 2010 and Germany provided funding over the past five years either directly or through the IMF or the European Stability Mechanism.
The IWH study says every time this year there was a spike in the Greek debt crisis, which made Greece’s exit from the euro appear more likely, German government bond yields fell. Whenever the news looked better, Germany’s bond yields increased.
Even if the situation were to calm down suddenly, Germany would still be expected to profit from the situation, the IWH argues, because medium- and long-term bonds issued in recent years are still far away from maturing.