貿易即是互通有無，可以是以物換物也可以透過貨幣作媒介，如鹽、貴金屬、貝殼甚或石頭。而全球貿易看似是今天才有的事，但早在十六、十七世紀就已經出現，歐洲人的大航海時代令分佈於世界各地的種族，以貿易來聯繫起來，將人、物、文化甚或疾病沿海路在七大洲之間往來。
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