The price of old books on the Confucius old book website was higher than the price of new books on Duoduo because of the following reasons: 1. copyright protection: The old books on the Confucius Old Book Network may be written by some well-known authors, so the copyright of these books may be more expensive. The new books on Pinduoduo might be old books published by some emerging publishing houses or authors whose copyright protection might not be as good as Confucius 'old book website. 2. Market supply and demand relationship: The number of old books on the Confucius Old Book Network may be relatively small, so the supply and demand relationship in the market may be relatively tight, resulting in higher prices. The number of new books on Pinduoduo was relatively large, so the supply and demand in the market might be more balanced, resulting in relatively low prices. 3. Sales channels: The Confucius Old Book Network may sell through some well-known e-commerce platforms. These platforms may charge a certain amount of processing fees, resulting in relatively high commodity prices. Pinduoduo, on the other hand, might sell at a relatively low price through some ordinary e-commerce platforms. The above are just some possible reasons. There may be other specific reasons.