For German media Deutsche Welle (DW) and Deutschlandfunk (DLF), Franz Waldenberger and Sebastian Polak-Rottmann have contributed their expertise in the fields of Japan’s economy and society, respectively. In a DW online article on Japan’s monetary policy, Franz Waldenberger explained that while the Japanese government was highly indebted, the economy as a whole was „rich“.  Japan’s share of net foreign assets as percentage of GDP was „among the highest in the world“, he said. „I call it ‚rich country, poor government'“. In a German-language DLF radio feature on the problem of Japan’s abandoned houses (akiya mondai), Sebastian Polak-Rottmann commented on abandoned houses are „a symptom of demographic change and of migration“ that could be observed both in rural and in urban areas. Since empty houses in rural areas often had strong family ties for their owners, many did not want to sell them, he explained.