Germany\'s leading economic think tanks on Thursday halved their 2013 growth forecast to 0.4 percent but said domestic demand may help drive a rebound next year. The four institutes -- the Ifo in Munich, DIW in Berlin, IW in Halle and RWI in Essen -- predicted that Germany would see 0.4-percent gross domestic product growth in 2013, compared to an earlier forecast of 0.8 percent, and said this would rise to 1.8 percent next year.