If Britain exits the EU, it could make trade more difficult in terms of customs and other trade formalities. The UK is also an important location for German tool and die makers.

More from DW's business desk:
http://www.dw.com/en/asian-traders-fear-brexit/av-19328282
http://www.dw.com/en/cameron-warns-british-voters-against-ukip-vision-of-little-england/a-19313054