25 Greatest Business Innovations of All Time

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3000 B.C.: Money

For the first million years of business, selling meant barter, which meant the traded good had to be physically transported and traded.  Money, on the other hand, allowed the value of goods to be traded rather than the goods themselves, thereby making it possible to sell mass quantities.

Fun fact: The largest coins ever "minted" are made of stone and weigh over 4 tons.