Whats the difference between a citizen, a metic, and a slave?

Metics were non-Athenians who generally found the cosmopolitan city of Athens more appealing than their own homelands. ... Slavery was a necessary institution in Athenian society. Slaves were the property of their owners and could be bought and sold at any time.Citizens are the people.

Explanation:

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im sorry i dont know a lot of this but ill try my best

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answer; protectionism fosters competition and keeps price regulated;