In Germany investments are at an all-time low despite negative debt rates and huge foreign account surpluses. Yet, according to think tanks such as Bruegel and Centre for European Reform, there is a need for investment in German infrastructure and in the education system. This would also appease German voters, who punished the government parties in recent EU elections, showing their displeasure at the resulting increasing number of low-paid workers. The graph below is very simple – just two lines. It was published on Twitter by Christian Odendahl, chief economist of the Centre for European Reform, accompanied by the few words characteristic of the medium.