Is paper expensive in Song Dynasty?

Song Dynasty is one of the most developed dynasties in China's history in culture, commodity economy and handicraft industry. The paper industry made a great breakthrough in the Song Dynasty. Driven by the huge consumption of paper, the variety, quality and quantity of paper reached a climax in the Song Dynasty. Paper was already a very common object in the Song Dynasty. Although ordinary people can't afford top-grade paper, there is no problem for ordinary people to consume ordinary paper in the Song Dynasty. If paper is too expensive for ordinary people to consume, how can the printing industry reach its peak in the Song Dynasty and create movable type printing? Therefore, paper was just an ordinary consumer product in the Song Dynasty, and it was not expensive. In addition to writing, the paper of the Song Dynasty has already entered the daily life of ordinary people, and it is also common for ordinary people to use some thick paper with low quality every day. There was a custom of burning paper money in Song Dynasty. Paper can be used for burning and playing. Do you think it is expensive?

Of course, it would be terrible if it was paper handed down to today's Song Dynasty. Song paper is almost impossible to find now, but today the price of a Song edition book is several million, and there is still no market price.