Books were first sold as expensive copies of manuscripts, which became much cheaper after the advent of the printing press  In the first few years of the printing press, the demand for books in the market doubled
In the first few years of the printing press, the quality of printed matter was far less than that of modern printed matter, and it was difficult to attract young people to buy it.
 This shows that the emergence of printed books has stimulated people's interest in reading and greatly increased the number of book buyers