Everyone has needs and wants but there are a limited amount of resources, so in order to have limits on what's being produced and who gets what, prices are put on products. Humans wants exceed the amount of resources there are but people can also be satisfied in different ways. Since there are a certain amount of resources they can also be used in deferent ways and this leads to how prices are determined.
Price determines what to produce, how much to produce, how to organize resources for production, and how to distribute output. So as you can see by this, price determines a lot of things. The economic system wouldn't be able to function without it. People have unlimited wants and just keep wanting more and more and in order for that to be controlled prices are set. This way people can only afford certain things and are limited to what wants they can get. This helps the resources that are scarce to be managed better and not run out as quickly as they would if there were no set prices.
https://www.youtube.com/watch?v=tzQ9vrvTAtk
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