Compare the following
1. In the middle of the 13th century, a scholar wanted to copy a book. But he did not have enough paper. So, he washed the writing off a manuscript he did not want, dried the paper and used it.
2. A century later, if you bought some food in the market, you could be lucky and have the shopkeeper wrap it for you in some paper. When was paper more expensive and easily available in the 13th or 14th century?