Why were manuscripts so expensive the earl fifteenth century

Your answer and explantion is down below. Hopefully it helps.

Books then where all hand written, and assembled by hand. This was a lot of work, and took time-for each and every copy. Additonally, it needed someone who could read and write to copy a text, and such people were in small numbers in the early 15th century, and had to be well paid for the work.

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pretty sure it is c

explanation: