Does anyone know how much Yang Xiren's calligraphy is worth?

the national certificate of retouching is 2, yuan/square foot, and the first retouching was 8, dollars. The artist took the initiative to lower the second retouching by 5, dollars, and now he asks to lower the current retouching to 2, yuan/square foot, and the market price is completely higher than the retouching price. Can be collected in large quantities