According to artnet, an online firm that tracks the art market, $76.9m worth of Mr Richter's work was sold at auction in 2010.

根据艺术网的信息，一家网上公司追踪了艺术市场。在2010年，里希特先生的一件作品在拍卖会上已七千六百九十万美元的价格售出。

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This trend accompanied a steady decline in prices for modern, impressionist, and old masters over the same time period, according to artnet.

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Last year, Mitchell's canvases were the two most expensive works by any woman artist sold at auction, according to auction database Artnet.

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"All of my collectors say things like, -I looked up that artist on Artnet.com and their record is such-and-such, '" says art adviser Kim M.

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