I would say its because no one really decided to change anything. No one during the old ages really knew how to do anything and only used what they had and what was closest to them.
How many people would be interested in what they are selling would be the most influential.
I think riches. im not 100% sure but either they where looking for riches or they found riches not sure
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Thank you for giving us the answer, really appreaciate it!!!!