Why do people need to buy and sell products or services? people need to provide the market with goods and services. people need to buy and sell products to make a profit. we need to maintain a competitive society. in today's world, no one is completely self-sufficient?

The answer is "no one is completely self-sufficient".

Being self sufficient means that one is able to supply one's own or its own needs without external assistance which in an individual case is impossible, everyone needs to rely for some service or something on others, and other people rely on someone too for a specific service this is how a society works.

no one is completely self-sufficient?

Explanation:

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