Abstract-Stack Overflow can be seen as an information market for software engineering knowledge in which the goods that are exchanged are answers to questions and the rewards are score points and badges that contribute to a users reputation. By analyzing the transactions in Stack Overflow we can get a glimpse of the way in which the different geographical regions in the world contribute to the knowledge market represented by the website. In this paper we aggregate the knowledge transfer from the level of the users to the level of geographical regions and learn that Europe and North America are the principal and virtually equal contributors; Asia comes as a distant third, mainly represented by India; and Oceania contributes less than Asia but more than South America and Africa together.

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