What ways could a wizard buy supplies?

I am in the proccess of starting my second chapter of my book. I need a few influences or basic ideas from our society and previous societies of how t

I am in the proccess of starting my second chapter of my book. I need a few influences or basic ideas from our society and previous societies of how trade worked and ways of trading.

or:I am in the proccess of starting my second chapter of my book. I need a few influences or basic ideas from our society and previous societies of how trade worked and ways of trading.

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