The price of Cao's calligraphy works, what is the latest market price in July 20 17!

China Art Masters Network, China Guo Yi Painting and Calligraphy Institute and Zhong Yi Network (Document No.06, No.2017) informed that Comrade Cao was awarded the title of Master as a national art leader. From June, 2065438 to June, 2007, the market price of Cao's calligraphy works was estimated to be 500,000-800,000 yuan/sq. ft. according to the certificate issued by China artist Runge (owned by official website).