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Are these f.r.e.e points? if they are thank you very much!
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3. If you buy a new cell phone, your opportunity cost is the time you could spend talking on the phone.
I think both Imperial China and Rome were both able to create a strict government. They were able to create a social stratification that allows people to function according to their designated roles, They were able to enforce a strong military which leads to successful conquest of neighboring states.
