Firstly, flea market helps sellers make full use of their belongings meanwhile earn money. The useless materials of the sellers can be sold at a good price in the flea market, which is better than throwing them away. Secondly, flea market helps buyers get what they want economically. Sometimes the new books or materials are far more expensive than the old ones while the latter are as useful as the former. What’s more, some notes on the used books can help the buyers efficiently.
Lastly, flea market helps protect the environment. When the used materials are turned over to the buyers, a lot of cost on producing new ones is saved. And the resources of study can be used repeatedly by the students through the second hand trade. We also form a good habit of reusing these things. Since the “useless” materials find their use in flea market, there are less pollution of rubbish to some extent.
In a word, market can help sellers, buyers, and the protection of environment. So you have something no longer useful, you can think of selling them in the flea market other than throwing them into the rubbish
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