Jim McKelvey and Jack Dorsey created the payment tool Square to fix a problem small businesses had with credit card transactions. In the early days of Square, Amazon made a competing tool. For most small businesses, that usually means the beginning of the end. But not for Square. Jim and Jack did the unthinkable: they beat Amazon. Jim tells Nicole how they did it through what Jim calls Innovation Stack. 
Find Jim's book The Innovation Stack here: https://www.jimmckelvey.com/books/
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