Something that many auto industry investors watch -- or should be watching -- is the Chinese auto market, especially China's market for luxury cars. It may seem like a small niche, but companies from General Motors (NYSE:GM) to Ford (NYSE:F) to Nissan (OTC:NSANY) are making huge investments in new luxury models -- with the goal of capturing a piece of this lucrative and booming market.

That makes trends in China important to investors in all of these companies. In this video, Fool contributor John Rosevear looks at two indicators: a leading ultra-luxury brand's prediction that sales growth will fall in 2014 and a big investment by BMW (OTC:BAMXF) as it moves to surpass rival Audi.