By this I mean a semi-scientific treatise on the topic, since published scientific data is likely to be rare and most of the data is based on extrapolations or estimates by experts. On the one hand, I would briefly discuss the general decline in production in the automotive industry for years and support it with scientific data, then the bridge can be quickly built on the Corona crisis, and more recent data in a global comparison, and from Germany in particular, be used. Since this is all about sales, the corresponding numbers are shown in tables or diagrams, of course with a mention of the reputable source.