How much are Zhang Kai's calligraphy and calligraphy works? How to identify them? How much is it worth?

The same and different calligraphy and paintings have different prices in different people's eyes, but no matter whose calligraphy and paintings are good or bad, they are valuable and worthless, expensive and relatively cheap, and can't be discussed by square. Long Ge has no purpose, just a reference, mainly depending on our own judgment and understanding of his calligraphy and painting, as well as the hype in the market at that time. The price of a painting and calligraphy will be different in different places, different times and different auctioneers. For example, some paintings and calligraphy by the same person are worth 1000 yuan/square foot, some are 2000 yuan/square foot, some may be 3000 yuan/square foot, ... even 1 000 yuan, tens of thousands/square foot ...; And changing to another auctioneer or intermediary is another situation, which is difficult to judge and there is no absolute price.