What is the market price of Nanjing Li calligraphy?

Nan, male, the word Wuming, whose real name is Shiyue, Xiaju, owner of Wumingzhai and owner of Hongxintang; Party member, college degree, economist, member of China Hard Pen Calligraphers Association, member of Education Committee of China Calligraphy Art Research Institute, member of Henan Calligraphy Association, vice president of Henan Calligraphy Professional Committee and vice president of Henan Calligraphy Research Institute.

Market price of works 1000-5000/ square foot. How was work?