SHANGHAI: Some of the new Chinese cars unveiled at this week's Shanghai Auto Show are affordable for millions of buyers _ a happy development for Beijing that might prove costly for the global automakers producing them. General Motors Co. unveiled the 630 sedan, the first model from its new Baojun badge developed with Chinese joint venture partners. The four-door is based on an older GM car and will have a sticker price of 70,000 to 100,000 yuan ($10,700 to $15,300). Honda Motor Co. displayed the plain, compact four-door S1 at the auto show, the first from its new Everus line which went on sale this week. Nissan Motor Co. showed off an unnamed car it plans to sell under the Venucia brand next year. These so-called “indigenous” brands will only be sold in China and their prices are aimed at a segment of the market that is already crowded with cars from lesser known Chinese brands. They'll also be in competition with the foreign automakers' existing entry